ElasticPress

A fast and flexible search and query engine for WordPress.

Please note: master is the stable branch

Upgrade Notice: Versions 1.6.1, 1.6.2, 1.7, 1.8, 2.1, 2.1.2, 2.2 require re-syncing.

ElasticPress, a fast and flexible search and query engine for WordPress, enables WordPress to find or “query” relevant content extremely fast through a variety of highly customizable features. WordPress out-of-the-box struggles to analyze content relevancy and can be very slow. ElasticPress supercharges your WordPress website making for happier users and administrators. The plugin even contains features for popular plugins.

How Does it Work

ElasticPress integrates with the WP_Query object returning results from Elasticsearch instead of MySQL.

Requirements

• Elasticsearch 1.7 - 5.2 (2.0+ highly recommended)
• WordPress 3.7.1+

Installation

1. First, you will need to properly install and configure Elasticsearch.
2. Install the plugin in WordPress. You can download a zip via Github and upload it using the WordPress plugin uploader.
3. Activate the plugin (network activate for multisite). Navigate to the settings page. You should see an ElasticPress icon in your admin menu.
4. Input your Elasticsearch host. Your host must begin with a protocol specifier (http or https). URLs without a protocol prefix will not be parsed correctly and will cause ElasticPress to error out.
5. Sync your content by clicking the sync icon.

Once syncing finishes, your site is officially supercharged. You also have access to ElasticPress's powerful WP_Query integration API.

Features

Search

Beef up your search to be more accurate, search tags, categories, and other taxonomies, catch misspellings, weight content by recency and more.

WooCommerce

Allow customers to filter through products faster and improve product search relevancy. This feature will increase your sales bottom line and reduce administrative costs.

Related Posts

Help users easily find related content by adding related posts to the end of each post.

Protected Content

Help editors more effectively browse through content. Load long lists of posts faster. Filter posts faster. Please note this syncs draft content to Elasticsearch. Enabling this feature will allow other ElasticPress features to work within the admin (i.e. WooCommerce and Search). You'll need to make sure your Elasticsearch instance is properly secured.

WP_Query and the ElasticPress Query Integration

ElasticPress integrates with WP_Query if the ep_integrate parameter is passed (see below) to the query object. If the search feature is activated (which it is by default), all queries with the s parameter will be integrated with as well. ElasticPress converts WP_Query arguments to Elasticsearch readable queries. Supported WP_Query parameters are listed and explained below. ElasticPress also adds some extra WP_query arguments for extra functionality.

Supported WP_Query Parameters

• ep_integrate (bool)

  Allows you to run queries through Elasticsearch instead of MySQL. This parameter is the meat of the plugin. For example:

  Get 20 of the latest posts

  new WP_Query( array(
      'ep_integrate'   => true,
      'post_type'      => 'post',
      'posts_per_page' => 20,
  ) );

  Get all posts with a specific category slug

  new WP_Query( array(
      'ep_integrate'   => true,
      'post_type'      => 'post',
      'posts_per_page' => -1,
      'tax_query' => array(
          array(
              'taxonomy' => 'category',
              'terms'    => array( 'term-slug' ),
              'field'    => 'slug',
          ),
      ),
  ) );

  Setting ep_integrate to false will override the s parameter if provided.

• s (string)

  Search keyword. By default used to search against post_title, post_content, and post_excerpt. (Requires search feature)

• posts_per_page (int)

  Number of posts to show per page. Use -1 to show all posts (the offset parameter is ignored with a -1 value). Set the paged parameter to paginate based on posts_per_page.

• tax_query (array)

  Filter posts by terms in taxonomies. Takes an array of form:

  new WP_Query( array(
      's'         => 'search phrase',
      'tax_query' => array(
          array(
              'taxonomy' => 'taxonomy-name',
              'field'    => 'slug',
              'terms'    => array( 'term-slug-1', 'term-slug-2', ... ),
          ),
      ),
  ) );

  tax_query accepts an array of arrays where each inner array only supports taxonomy (string), field (string), and terms (string|array) parameters. field must be set to slug, name, or term_id. The default value for field is term_id. terms must be a string or an array of term slug(s), name(s), or id(s).

• The following shorthand parameters can be used for querying posts by specific dates:

  • year (int) - 4 digit year (e.g. 2011).
  • month or monthnum (int) - Month number (from 1 to 12).
  • week (int) - Week of the year (from 0 to 53).
  • day (int) - Day of the month (from 1 to 31).
  • dayofyear (int) - Day of the month (from 1 to 365 or 366 for leap year).
  • hour (int) - Hour (from 0 to 23).
  • minute (int) - Minute (from 0 to 59).
  • second (int) - Second (0 to 59).
  • dayofweek (int|array) - Weekday number, when week starts at Sunday (1 to 7).
  • dayofweek_iso (int|array) - Weekday number, when week starts at Monday (1 to 7).

  This is a simple example which will return posts which are created on January 1st of 2012 from all sites:

  new WP_Query( array(
      's' => 'search phrase',
      'sites' => 'all',
      'year'  => 2012,
      'monthnum' => 1,
      'day'   => 1,
  ) );

• date_query (array)

  date_query accepts an array of keys and values (array|string|int) to find posts created on specific dates/times as well as an array of arrays with keys and values (array|string|int|boolean) containing the following parameters after, before, inclusive, compare, column, and relation. column is used to query specific columns from the wp_posts table. This will return posts which are created after January 1st 2012 and January 3rd 2012 8AM GMT:

  new WP_Query( array(
      's' => 'search phrase',
      'date_query' => array(
          array(
              'column' => 'post_date',
              'after' => 'January 1st 2012',
          ),
          array(
              'column' => 'post_date_gmt',
              'after'  => 'January 3rd 2012 8AM',
          ),
      ),
  ) );

  Currently only the AND value is supported for the relation parameter.

  inclusive is used on after/before options to determine whether exact value should be matched or not. If inclusive is used and you pass in sting without specific time, it will be converted to 00:00:00 on that date. In this case, even if inclusive was set to true, the date would not be included in the query. If you want to include that specific date, you need to pass the time as well. (e.g. 'before' => '2012-01-03 23:59:59')

  The example will return all posts which are created on January 5th 2012 after 10:00PM and 11:00PM inclusively, because the time is specified:

  new WP_Query( array(
      's' => 'search phrase',
      'date_query' => array(
          array(
              'column' => 'post_date',
              'before' => 'January 5th 2012 11:00PM',
          ),
          array(
              'column' => 'post_date',
              'after'  => 'January 5th 2012 10:00PM',
          ),
          'inclusive' => true,
      ),
  ) );

  compare supports the following options:

  • = - Posts will be returned that are created on a specified date.
  • != - Posts will be returned that are not created on a specified date.
  • > - Posts will be returned that are created after a specified date.
  • >= - Posts will be returned that are created on a specified date or after.
  • < - Posts will be returned that are created before a specified date.
  • <= - Posts will be returned that are created on a specified date or before that.
  • BETWEEN - Posts will be returned that are created between a specified range.
  • NOT BETWEEN - Posts will be returned that are created not in a specified range.
  • IN - Posts will be returned that are created on any of the specified dates.
  • NOT IN - Posts will be returned that are not created on any of the specified dates.

  compare can be combined with shorthand parameters as well as with after and before. This example will return all posts which are created during Monday to Friday, between 9AM to 5PM:

  new WP_Query( array(
      's' => 'search phrase',
      'date_query' => array(
          array(
              'hour'      => 9,
              'compare'   => '>=',
          ),
          array(
              'hour'      => 17,
              'compare'   => '<=',
          ),
          array(
              'dayofweek' => array( 2, 6 ),
              'compare'   => 'BETWEEN',
          ),
      ),
  ) );

• meta_query (array)

  Filter posts by post meta conditions. Meta arrays and objects are serialized due to limitations of Elasticsearch. Takes an array of form:

  new WP_Query( array(
      's'          => 'search phrase',
      'meta_query' => array(
          array(
              'key'   => 'key_name',
              'value' => 'meta value',
              'compare' => '=',
          ),
      ),
  ) );

  meta_query accepts an array of arrays where each inner array only supports key (string), type (string), value (string|array|int), and compare (string) parameters. compare supports the following:

  * ```=``` - Posts will be returned that have a post meta key corresponding to ```key``` and a value that equals the value passed to ```value```.
  * ```!=``` - Posts will be returned that have a post meta key corresponding to ```key``` and a value that does NOT equal the value passed to ```value```.
  * ```>``` - Posts will be returned that have a post meta key corresponding to ```key``` and a value that is greater than the value passed to ```value```.
  * ```>=``` - Posts will be returned that have a post meta key corresponding to ```key``` and a value that is greater than or equal to the value passed to ```value```.
  * ```<``` - Posts will be returned that have a post meta key corresponding to ```key``` and a value that is less than the value passed to ```value```.
  * ```<=``` - Posts will be returned that have a post meta key corresponding to ```key``` and a value that is less than or equal to the value passed to ```value```.
  * ```EXISTS``` - Posts will be returned that have a post meta key corresponding to ```key```.
  * ```NOT EXISTS``` - Posts will be returned that do not have a post meta key corresponding to ```key```.
  

  The outer array also supports a relation (string) parameter. By default relation is set to AND:

  new WP_Query( array(
      's'          => 'search phrase',
      'meta_query' => array(
          array(
              'key'   => 'key_name',
              'value' => 'meta value',
              'compare' => '=',
          ),
          array(
              'key'   => 'key_name2',
              'value' => 'meta value',
              'compare' => '!=',
          ),
          'relation' => 'AND',
      ),
  ) );

  Possible values for relation are OR and AND. If relation is set to AND, all inner queries must be true for a post to be returned. If relation is set to OR, only one of the inner meta queries must be true for the post to be returned.

  type supports the following values: 'NUMERIC', 'BINARY', 'CHAR', 'DATE', 'DATETIME', 'DECIMAL', 'SIGNED', 'TIME', and 'UNSIGNED'. By default WordPress casts meta values to these types in MySQL so some of these don't make sense in the context of Elasticsearch. ElasticPress does no "runtime" casting but instead compares the value to a different type compiled during indexing

  • NUMERIC - Compares query value to integer version of stored meta value.
  • SIGNED - Compares query value to integer version of stored meta value.
  • UNSIGNED - Compares query value to integer version of stored meta value.
  • BINARY - Compares query value to raw, unanalyzed version of stored meta value. For actual attachment searches, check out this.
  • CHAR - Compares query value to raw, unanalyzed version of stored meta value.
  • DECIMAL - Compares query value to float version of stored meta value.
  • DATE - Compares query value to date version of stored meta value. Query value must be formatted like 2015-11-14
  • DATETIME - Compares query value to date/time version of stored meta value. Query value must be formatted like 2012-01-02 05:00:00 or yyyy:mm:dd hh:mm:ss.
  • TIME - Compares query value to time version of stored meta value. Query value must be formatted like 17:00:00 or hh:mm:ss.

  If no type is specified, ElasticPress will just deduce the type from the comparator used. type is very rarely needed to be used.

• meta_key (string)

  Allows you to query meta with the defined key. Requires meta_value or meta_value_num be used as well.

• meta_value (string)

  This value will be queried against the key defined in meta_key.

• meta_value_num (string)

  This value will be queried against the key defined in meta_key.

• post_type (string/array)

  Filter posts by post type. any will search all public post types. WP_Query defaults to either post or any if no post_type is provided depending on the context of the query. This is confusing. ElasticPress will ALWAYS default to any if no post_type is provided. If you want to search for post posts, you MUST specify post as the post_type.

• post__in (array)

  Specify post IDs to retrieve.

• post__not_in (array)

  Specify post IDs to exclude.

• offset (int)

  Number of posts to skip in ascending order.

• paged (int)

  Page number of posts to be used with posts_per_page.

• author (int)

  Show posts associated with certain author ID.

• author_name (string)

  Show posts associated with certain author. Use user_nicename (NOT name).

• orderby (string)

  Order results by field name instead of relevance. Supports: title, modified, meta_value, meta_value_num, type, name, date, and relevance; anything else will be interpretted as a document path i.e. meta.my_key.long or meta.my_key.raw. You can sort by multiple fields as well i.e. title meta.my_key.raw

• order (string)

  Which direction to order results in. Accepts ASC and DESC. Default is DESC.

• post_parent (int)

  Show posts that have the specified post parent.

The following are special parameters that are only supported by ElasticPress.

• search_fields (array)

  If not specified, defaults to array( 'post_title', 'post_excerpt', 'post_content' ).

  • post_title (string)

    Applies current search to post titles.

  • post_content (string)

    Applies current search to post content.

  • post_excerpt (string)

    Applies current search to post excerpts.

  • taxonomies (string => array/string)

    Applies the current search to terms within a taxonomy or taxonomies. The following will fuzzy search across post_title, post_excerpt, post_content, and terms within taxonomies category and post_tag:

    new WP_Query( array(
        's'             => 'term search phrase',
        'search_fields' => array(
            'post_title',
            'post_content',
            'post_excerpt',
            'taxonomies' => array( 'category', 'post_tag' ),
        ),
    ) );

  • meta (string => array/string)

    Applies the current search to post meta. The following will fuzzy search across post_title, post_excerpt, post_content, and post meta keys meta_key_1 and meta_key_2:

    new WP_Query( array(
        's'             => 'meta search phrase',
        'search_fields' => array(
            'post_title',
            'post_content',
            'post_excerpt',
            'meta' => array( 'meta_key_1', 'meta_key_2' ),
        ),
    ) );

  • author_name (string)

    Applies the current search to author login names. The following will fuzzy search across post_title, post_excerpt, post_content and author user_login:

    new WP_Query( array(
        's'             => 'username',
        'search_fields' => array(
            'post_title',
            'post_content',
            'post_excerpt',
            'author_name',
        ),
    ) );

• aggs (array)

  Add aggregation results to your search result. For example:

  new WP_Query( array(
      's'    => 'search phrase',
      'aggs' => array(
          'name'       => 'name-of-aggregation', // (can be whatever you'd like)
          'use-filter' => true // (*bool*) used if you'd like to apply the other filters (i.e. post type, tax_query, author), to the aggregation
          'aggs'       => array(
              'name'  => 'name-of-sub-aggregation',
              'terms' => array(
                  'field' => 'terms.name-of-taxonomy.name-of-term',
              ),
          ),
      ),
  ) );

• cache_results (boolean)

  This is a built-in WordPress parameter that caches retrieved posts for later use. It also forces meta and terms to be pulled and cached for each cached post. It is extremely important to understand when you use this parameter with ElasticPress that terms and meta will be pulled from MySQL not Elasticsearch during caching. For this reason, cache_results defaults to false.

• sites (int/string/array)

  This parameter only applies in a multi-site environment. It lets you search for posts on specific sites or across the network.

  By default, sites defaults to current which searches the current site on the network:

  new WP_Query( array(
      's'     => 'search phrase',
      'sites' => 'current',
  ) );

  You can search on all sites across the network:

  new WP_Query( array(
      's'     => 'search phrase',
      'sites' => 'all',
  ) );

  You can also specify specific sites by id on the network:

  new WP_Query( array(
      's'     => 'search phrase',
      'sites' => 3,
  ) );

  You can even specify a group of specific sites on the network:

  new WP_Query( array(
      's'     => 'search phrase',
      'sites' => array( 2, 3 ),
  ) );

  Note: Nesting cross-site WP_Query loops can result in unexpected behavior.

WP-CLI Commands

The following commands are supported by ElasticPress:

• wp elasticpress index [--setup] [--network-wide] [--posts-per-page] [--nobulk] [--offset] [--show-bulk-errors] [--post-type] [--keep-active]

  Index all posts in the current blog.

  • --network-wide will force indexing on all the blogs in the network. --network-wide takes an optional argument to limit the number of blogs to be indexed across where 0 is no limit. For example, --network-wide=5 would limit indexing to only 5 blogs on the network.
  • --setup will clear the index first and re-send the put mapping.
  • --posts-per-page let's you determine the amount of posts to be indexed per bulk index (or cycle).
  • --nobulk let's you disable bulk indexing.
  • --offset let's you skip the first n posts (don't forget to remove the --setup flag when resuming or the index will be emptied before starting again).
  • --show-bulk-errors displays the error message returned from Elasticsearch when a post fails to index (as opposed to just the title and ID of the post).
  • --post-type let's you specify which post types will be indexed (by default: all indexable post types are indexed). For example, --post-type="my_custom_post_type" would limit indexing to only posts from the post type "my_custom_post_type". Accepts multiple post types separated by comma.

• wp elasticpress delete-index [--network-wide]

  Deletes the current blog index. --network-wide will force every index on the network to be deleted.

• wp elasticpress put-mapping [--network-wide]

  Sends plugin put mapping to the current blog index. --network-wide will force mappings to be sent for every index in the network.

• wp elasticpress recreate-network-alias

  Recreates the alias index which points to every index in the network.

• wp elasticpress activate-feature <feature-slug> [--network-wide]

  Activate a feature. If a re-indexing is required, you will need to do it manually. --network-wide will affect network activated ElasticPress.

• wp elasticpress deactivate-feature <feature-slug> [--network-wide]

  Deactivate a feature. --network-wide will affect network activated ElasticPress.

• wp elasticpress list-features [--all] [--network-wide]

  Lists active features. --all will show all registered features. --network-wide will force checking network options as opposed to a single sites options.

• wp elasticpress stats

  Returns basic stats on Elasticsearch instance i.e. number of documents in current index as well as disk space used.

• wp elasticpress status

Security

• ElasticPress can be used with the Elasticsearch Shield plugin

  • Define the constant ES_SHIELD in your wp-config.php file with the username and password of your Elasticsearch Shield user. For example:

define( 'ES_SHIELD', 'username:password' );

Custom Features

ElasticPress has a robust API for registering your own features. Refer to the code within each feature for detailed examples. To register a feature, you will need to call the ep_register_feature() function like so:

add_action( 'plugins_loaded', function() {
    ep_register_feature( 'slug', array(
        'title' => 'Pretty Title',
        'setup_cb' => 'setup_callback_function',
        'feature_box_summary_cb' => 'summary_callback_function',
        'feature_box_long_cb' => 'long_summary_callback_function',
        'requires_install_reindex' => true,
        'requirements_status_cb' => 'requirements_status_callback_function',
        'post_activation_cb' => 'post_activation_callback_function',
    ) );
} );

The only arguments that are really required are the slug and title of the associative arguments array. Here are descriptions of each of the associative arguments:

• title (string) - Pretty title for feature
• requires_install_reindex (boolean) - Setting to true will force a reindex after the feature is activated.
• setup_cb (callback) - Callback to a function to be called on each page load when the feature is activated.
• post_activation_cb (callback) - Callback to a function to be called after a feature is first activated.
• feature_box_summary_cb (callback) - Callback to a function that outputs HTML feature box summary (short description of feature).
• feature_box_long_cb (callback) - Callback to a function that outputs HTML feature box full description.
• requirements_status_cb (callback) - Callback to a function that determines if the features requirements are met. This function needs to return a EP_Feature_Requirements_Status object. EP_Feature_Requirements_Status is a simple class with a code and a message property. Code 0 means there are no requirement issues; code 1 means there are issues with warnings; code 2 means the feature does not have it's requirements met and cannot be used. The message property of the object can be used to store warnings.

If you build an open source custom feature, let us know! We'd be happy to list the feature within ElasticPress documentation.

Development

Setup

Follow the configuration instructions above to setup the plugin.

Testing

Within the terminal change directories to the plugin folder. Initialize your testing environment by running the following command:

For VVV users:

bash bin/install-wp-tests.sh wordpress_test root root localhost latest

For VIP Quickstart users:

bash bin/install-wp-tests.sh wordpress_test root '' localhost latest

where:

• wordpress_test is the name of the test database (all data will be deleted!)
• root is the MySQL user name
• root is the MySQL user password (if you're running VVV). Blank if you're running VIP Quickstart.
• localhost is the MySQL server host
• latest is the WordPress version; could also be 3.7, 3.6.2 etc.

Our test suite depends on a running Elasticsearch server. You can supply a host to PHPUnit as an environmental variable like so:

EP_HOST="http://192.168.50.4:9200" phpunit

Debugging

We have a Debug Bar Plugin available for ElasticPress. This tool allows you to examine all the ElasticPress queries on each page load.

Issues

If you identify any errors or have an idea for improving the plugin, please open an issue. We're excited to see what the community thinks of this project, and we would love your input!

License

ElasticPress is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.