[Mappings editor] Add support for constant_keyword field type

x-pack/plugins/index_management/public/application/components/mappings_editor/components/document_fields/fields/field_types/constant_keyword_type.tsx

@@ -0,0 +1,82 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+import React, { FunctionComponent } from 'react';
+import { i18n } from '@kbn/i18n';
+
+import { documentationService } from '../../../../../../services/documentation';
+import { UseField, Field, JsonEditorField } from '../../../../shared_imports';
+import { getFieldConfig } from '../../../../lib';
+import { NormalizedField } from '../../../../types';
+import { AdvancedParametersSection, EditFieldFormRow, BasicParametersSection } from '../edit_field';
+
+interface Props {
+  field: NormalizedField;
+}
+
+export const ConstantKeywordType: FunctionComponent<Props> = ({ field }) => {
+  return (
+    <>
+      <BasicParametersSection>
+        {/* Value field */}
+        <EditFieldFormRow
+          title={i18n.translate('xpack.idxMgmt.mappingsEditor.constantKeyword.valueFieldTitle', {
+            defaultMessage: 'Set value',
+          })}
+          description={i18n.translate(
+            'xpack.idxMgmt.mappingsEditor.constantKeyword.valueFieldDescription',
+            {
+              defaultMessage:
+                'The value of this field for all documents in the index. If not specified, defaults to the value specified in the first document indexed.',
+            }
+          )}
+          defaultToggleValue={field.source?.value !== undefined}
+        >
+          <UseField path="value" config={getFieldConfig('value')} component={Field} />
+        </EditFieldFormRow>
+      </BasicParametersSection>
+
+      <AdvancedParametersSection>
+        {/* Meta field */}
+        <EditFieldFormRow
+          title={i18n.translate('xpack.idxMgmt.mappingsEditor.constantKeyword.metaFieldTitle', {
+            defaultMessage: 'Set metadata',
+          })}
+          description={i18n.translate(
+            'xpack.idxMgmt.mappingsEditor.constantKeyword.metaFieldDescription',
+            {
+              defaultMessage:
+                'Arbitrary information about the field. Specify as JSON key-value pairs.',
+            }
+          )}
+          defaultToggleValue={field.source?.meta !== undefined}
+          docLink={{
+            text: i18n.translate('xpack.idxMgmt.mappingsEditor.constantKeyword.metaDocLinkText', {
+              defaultMessage: 'Metadata documentation',
+            }),
+            href: documentationService.getMetaLink(),
+          }}
+        >
+          <UseField
+            path="meta"
+            config={getFieldConfig('meta')}
+            component={JsonEditorField}
+            componentProps={{
+              euiCodeEditorProps: {
+                height: '300px',
+                'aria-label': i18n.translate(
+                  'xpack.idxMgmt.mappingsEditor.constantKeyword.metaFieldAriaLabel',
+                  {
+                    defaultMessage: 'metadata field data editor',
+                  }
+                ),
+              },
+            }}
+          />
+        </EditFieldFormRow>
+      </AdvancedParametersSection>
+    </>
+  );
+};

x-pack/plugins/index_management/public/application/components/mappings_editor/components/document_fields/fields/field_types/index.ts

@@ -28,6 +28,7 @@ import { ObjectType } from './object_type';
 import { OtherType } from './other_type';
 import { NestedType } from './nested_type';
 import { JoinType } from './join_type';
+import { ConstantKeywordType } from './constant_keyword_type';
 import { RankFeatureType } from './rank_feature_type';
 import { WildcardType } from './wildcard_type';
 
@@ -54,6 +55,7 @@ const typeToParametersFormMap: { [key in DataType]?: ComponentType<any> } = {
   other: OtherType,
   nested: NestedType,
   join: JoinType,
+  constant_keyword: ConstantKeywordType,
   rank_feature: RankFeatureType,
   wildcard: WildcardType,
 };

x-pack/plugins/index_management/public/application/components/mappings_editor/constants/data_types_definition.tsx

@@ -71,6 +71,26 @@ export const TYPE_DEFINITION: { [key in DataType]: DataTypeDefinition } = {
       </p>
     ),
   },
+  constant_keyword: {
+    value: 'constant_keyword',
+    label: i18n.translate('xpack.idxMgmt.mappingsEditor.dataType.constantKeywordDescription', {
+      defaultMessage: 'Constant keyword',
+    }),
+    documentation: {
+      main: '/keyword.html#constant-keyword-field-type',
+    },
+    description: () => (
+      <p>
+        <FormattedMessage
+          id="xpack.idxMgmt.mappingsEditor.dataType.constantKeywordLongDescription"
+          defaultMessage="Constant keyword fields are a special type of keyword fields for fields that contain the same keyword across all documents in the index. Supports the same queries and aggregations as {keyword} fields."
+          values={{
+            keyword: <EuiCode inline>{'keyword'}</EuiCode>,
+          }}
+        />
+      </p>
+    ),
+  },
   numeric: {
     value: 'numeric',
     label: i18n.translate('xpack.idxMgmt.mappingsEditor.dataType.numericDescription', {
@@ -822,6 +842,7 @@ export const MAIN_TYPES: MainType[] = [
   'binary',
   'boolean',
   'completion',
+  'constant_keyword',
   'date',
   'date_nanos',
   'dense_vector',

x-pack/plugins/index_management/public/application/components/mappings_editor/constants/parameters_definition.tsx

@@ -29,7 +29,7 @@ import { INDEX_DEFAULT } from './default_values';
 import { TYPE_DEFINITION } from './data_types_definition';
 
 const { toInt } = fieldFormatters;
-const { emptyField, containsCharsField, numberGreaterThanField } = fieldValidators;
+const { emptyField, containsCharsField, numberGreaterThanField, isJsonField } = fieldValidators;
 
 const commonErrorMessages = {
   smallerThanZero: i18n.translate(
@@ -404,6 +404,88 @@ export const PARAMETERS_DEFINITION: { [key in ParameterName]: ParameterDefinitio
     },
     schema: t.string,
   },
+  value: {
+    fieldConfig: {
+      defaultValue: '',
+      type: FIELD_TYPES.TEXT,
+      label: i18n.translate('xpack.idxMgmt.mappingsEditor.parameters.valueLabel', {
+        defaultMessage: 'Value',
+      }),
+    },
+    schema: t.string,
+  },
+  meta: {
+    fieldConfig: {
+      defaultValue: '',
+      label: i18n.translate('xpack.idxMgmt.mappingsEditor.parameters.metaLabel', {
+        defaultMessage: 'Metadata',
+      }),
+      helpText: (
+        <FormattedMessage
+          id="xpack.idxMgmt.mappingsEditor.parameters.metaHelpText"
+          defaultMessage="Use JSON format: {code}"
+          values={{
+            code: <EuiCode>{JSON.stringify({ arbitrary_key: 'anything_goes' })}</EuiCode>,
+          }}
+        />
+      ),
+      validations: [
+        {
+          validator: isJsonField(
+            i18n.translate('xpack.idxMgmt.mappingsEditor.parameters.metaFieldEditorJsonError', {
+              defaultMessage: 'Invalid JSON.',
+            }),
+            { allowEmptyString: true }
+          ),
+        },
+        {
+          validator: ({ value }: ValidationFuncArg<any, string>) => {
+            if (typeof value !== 'string' || value.trim() === '') {
+              return;
+            }
+
+            const json = JSON.parse(value);
+            const valuesAreNotString = Object.values(json).some((v) => typeof v !== 'string');
+
+            if (Array.isArray(json)) {
+              return {
+                message: i18n.translate(
+                  'xpack.idxMgmt.mappingsEditor.parameters.metaFieldEditorArraysNotAllowedError',
+                  {
+                    defaultMessage: 'Arrays are not allowed.',
+                  }
+                ),
+              };
+            } else if (valuesAreNotString) {
+              return {
+                message: i18n.translate(
+                  'xpack.idxMgmt.mappingsEditor.parameters.metaFieldEditorOnlyStringValuesAllowedError',
+                  {
+                    defaultMessage: 'Values must be a string.',
+                  }
+                ),
+              };
+            }
+          },
+        },
+      ],
+      deserializer: (value: any) => {
+        if (value === '') {
+          return value;
+        }
+        return JSON.stringify(value, null, 2);
+      },
+      serializer: (value: string) => {
+        const parsed = JSON.parse(value);
+        // If an empty object was passed, strip out this value entirely.
+        if (!Object.keys(parsed).length) {
+          return undefined;
+        }
+        return parsed;
+      },
+    },
+    schema: t.any,
+  },
   max_input_length: {
     fieldConfig: {
       defaultValue: 50,

x-pack/plugins/index_management/public/application/components/mappings_editor/types/document_fields.ts

@@ -59,6 +59,7 @@ export type MainType =
   | 'geo_point'
   | 'geo_shape'
   | 'token_count'
+  | 'constant_keyword'
   | 'wildcard'
   /**
    * 'other' is a special type that only exists inside of MappingsEditor as a placeholder
@@ -146,7 +147,9 @@ export type ParameterName =
   | 'dims'
   | 'depth_limit'
   | 'relations'
-  | 'max_shingle_size';
+  | 'max_shingle_size'
+  | 'value'
+  | 'meta';
 
 export interface Parameter {
   fieldConfig: FieldConfig;

x-pack/plugins/index_management/public/application/services/documentation.ts

@@ -123,6 +123,10 @@ class DocumentationService {
     return `${this.esDocsBase}/ignore-malformed.html`;
   }
 
+  public getMetaLink() {
+    return `${this.esDocsBase}/mapping-field-meta.html`;
+  }
+
   public getFormatLink() {
     return `${this.esDocsBase}/mapping-date-format.html`;
   }