Add token pruning to clients for text expansion query (#2370)

* Add pruning config to text_expansion query

* Add weighted tokens query

* Linting

* PR feedback - float to int

* PR feedback - omit value

* Revise comment

* PR feedback, remove additional property

* Linting

specification/_types/query_dsl/TextExpansionQuery.ts

@@ -17,11 +17,17 @@
  * under the License.
  */
 
+import { TokenPruningConfig } from './TokenPruningConfig'
 import { QueryBase } from './abstractions'
 
 export class TextExpansionQuery extends QueryBase {
   /** The text expansion NLP model to use */
   model_id: string
   /** The query text */
   model_text: string
+  /** Token pruning configurations
+   * @availability stack since=8.13.0 stability=experimental
+   * @availability serverless stability=experimental
+   */
+  pruning_config?: TokenPruningConfig
 }

specification/_types/query_dsl/TokenPruningConfig.ts

@@ -0,0 +1,35 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { float, integer } from '@_types/Numeric'
+
+export class TokenPruningConfig {
+  /** Tokens whose frequency is more than this threshold times the average frequency of all tokens in the specified field are considered outliers and pruned.
+   * @server_default 5
+   */
+  tokens_freq_ratio_threshold?: integer
+  /** Tokens whose weight is less than this threshold are considered nonsignificant and pruned.
+   * @server_default 0.4
+   */
+  tokens_weight_threshold?: float
+  /** Whether to only score pruned tokens, vs only scoring kept tokens.
+   * @server_default false
+   */
+  only_score_pruned_tokens?: boolean
+}

specification/_types/query_dsl/WeightedTokensQuery.ts

@@ -0,0 +1,32 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { AdditionalProperty } from '@spec_utils/behaviors'
+import { TokenPruningConfig } from './TokenPruningConfig'
+import { QueryBase } from './abstractions'
+import { Field, FieldValue } from '@_types/common'
+import { Dictionary } from '@spec_utils/Dictionary'
+import { float } from '@_types/Numeric'
+
+export class WeightedTokensQuery extends QueryBase {
+  /** The tokens representing this query */
+  tokens: Dictionary<string, float>
+  /** Token pruning configurations */
+  pruning_config?: TokenPruningConfig
+}