Add the track_total_hits option to the query

CHANGELOG.md

@@ -4,6 +4,8 @@
 
 ### New Features
 
+  * [#801](https://github.com/toptal/chewy/pull/801): Add the [`track_total_hits`](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-your-data.html#track-total-hits) option to the query. ([@milk1000cc][])
+
 ### Changes
 
 ### Bugs Fixed
@@ -674,6 +676,7 @@
 [@mattzollinhofer]: https://github.com/mattzollinhofer
 [@menglewis]: https://github.com/menglewis
 [@mikeyhogarth]: https://github.com/mikeyhogarth
+[@milk1000cc]: https://github.com/milk1000cc
 [@mkcode]: https://github.com/mkcode
 [@mpeychich]: https://github.com/mpeychich
 [@mrbrdo]: https://github.com/mrbrdo

lib/chewy/search/parameters/track_total_hits.rb

@@ -0,0 +1,16 @@
+require 'chewy/search/parameters/storage'
+
+module Chewy
+  module Search
+    class Parameters
+      # Just a standard boolean storage, nothing to see here.
+      #
+      # @see Chewy::Search::Parameters::BoolStorage
+      # @see Chewy::Search::Request#track_total_hits
+      # @see https://www.elastic.co/guide/en/elasticsearch/reference/current/search-your-data.html#track-total-hits
+      class TrackTotalHits < Storage
+        include BoolStorage
+      end
+    end
+  end
+end

lib/chewy/search/request.rb

@@ -21,7 +21,7 @@ class Request
       EVERFIELDS = %w[_index _type _id _parent].freeze
       DELEGATED_METHODS = %i[
         query filter post_filter order reorder docvalue_fields
-        track_scores request_cache explain version profile
+        track_scores track_total_hits request_cache explain version profile
         search_type preference limit offset terminate_after
         timeout min_score source stored_fields search_after
         load script_fields suggest aggs aggregations none
@@ -336,6 +336,19 @@ def reorder(value, *values)
       #   @param value [true, false]
       #   @return [Chewy::Search::Request]
       #
+      # @!method track_total_hits(value = true)
+      #   Replaces the value of the `track_total_hits` parameter with the provided value.
+      #
+      #   @example
+      #     PlacesIndex.track_total_hits
+      #     # => <PlacesIndex::Query {..., :body=>{:track_total_hits=>true}}>
+      #     PlacesIndex.track_total_hits.track_total_hits(false)
+      #     # => <PlacesIndex::Query {:index=>["places"]}>
+      #   @see Chewy::Search::Parameters::TrackTotalHits
+      #   @see https://www.elastic.co/guide/en/elasticsearch/reference/current/search-your-data.html#track-total-hits
+      #   @param value [true, false]
+      #   @return [Chewy::Search::Request]
+      #
       # @!method explain(value = true)
       #   Replaces the value of the `explain` parameter with the provided value.
       #
@@ -388,7 +401,7 @@ def reorder(value, *values)
       #   @see https://en.wikipedia.org/wiki/Null_Object_pattern
       #   @param value [true, false]
       #   @return [Chewy::Search::Request]
-      %i[track_scores explain version profile none].each do |name|
+      %i[track_scores track_total_hits explain version profile none].each do |name|
         define_method name do |value = true|
           modify(name) { replace!(value) }
         end

spec/chewy/search/parameters/track_total_hits_spec.rb

@@ -0,0 +1,5 @@
+require 'chewy/search/parameters/bool_storage_examples'
+
+describe Chewy::Search::Parameters::TrackTotalHits do
+  it_behaves_like :bool_storage, :track_total_hits
+end

spec/chewy/search/request_spec.rb

@@ -192,7 +192,7 @@
     specify { expect { subject.reorder(:foo) }.not_to change { subject.render } }
   end
 
-  %i[track_scores explain version profile].each do |name|
+  %i[track_scores track_total_hits explain version profile].each do |name|
     describe "##{name}" do
       specify { expect(subject.send(name).render[:body]).to include(name => true) }
       specify { expect(subject.send(name).send(name, false).render[:body]).to be_blank }