Add fuzzy_rewrite field

Author: svilen-mihaylov-elastic

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/fulltext/MultiMatch.java

@@ -50,6 +50,7 @@
 import static org.elasticsearch.common.logging.LoggerMessageFormat.format;
 import static org.elasticsearch.index.query.MultiMatchQueryBuilder.ANALYZER_FIELD;
 import static org.elasticsearch.index.query.MultiMatchQueryBuilder.FUZZINESS_FIELD;
+import static org.elasticsearch.index.query.MultiMatchQueryBuilder.FUZZY_REWRITE_FIELD;
 import static org.elasticsearch.index.query.MultiMatchQueryBuilder.FUZZY_TRANSPOSITIONS_FIELD;
 import static org.elasticsearch.index.query.MultiMatchQueryBuilder.GENERATE_SYNONYMS_PHRASE_QUERY;
 import static org.elasticsearch.index.query.MultiMatchQueryBuilder.LENIENT_FIELD;
@@ -124,6 +125,7 @@ public class MultiMatch extends FullTextFunction implements OptionalArgument, Po
         entry(ANALYZER_FIELD.getPreferredName(), KEYWORD),
         entry(GENERATE_SYNONYMS_PHRASE_QUERY.getPreferredName(), BOOLEAN),
         entry(FUZZINESS_FIELD.getPreferredName(), KEYWORD),
+        entry(FUZZY_REWRITE_FIELD.getPreferredName(), KEYWORD),
         entry(FUZZY_TRANSPOSITIONS_FIELD.getPreferredName(), BOOLEAN),
         entry(LENIENT_FIELD.getPreferredName(), BOOLEAN),
         entry(MAX_EXPANSIONS_FIELD.getPreferredName(), INTEGER),
@@ -190,6 +192,20 @@ public MultiMatch(
                     valueHint = { "AUTO", "1", "2" },
                     description = "Maximum edit distance allowed for matching."
                 ),
+                @MapParam.MapParamEntry(
+                    name = "fuzzy_rewrite",
+                    type = "keyword",
+                    valueHint = {
+                        "constant_score_blended",
+                        "constant_score",
+                        "constant_score_boolean",
+                        "top_terms_blended_freqs_N",
+                        "top_terms_boost_N",
+                        "top_terms_N" },
+                    description = "Method used to rewrite the query. See the rewrite parameter for valid values and more information. "
+                        + "If the fuzziness parameter is not 0, the match query uses a fuzzy_rewrite method of "
+                        + "top_terms_blended_freqs_${max_expansions} by default."
+                ),
                 @MapParam.MapParamEntry(
                     name = "fuzzy_transpositions",
                     type = "boolean",

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LocalPhysicalPlanOptimizerTests.java

@@ -1660,7 +1660,7 @@ public void testQStrOptionsPushDown() {
     public void testMultiMatchOptionsPushDown() {
         String query = """
             from test
-            | where MULTI_MATCH("Anna", first_name, last_name, {"slop": 10, "analyzer": "auto",
+            | where MULTI_MATCH("Anna", first_name, last_name, {"fuzzy_rewrite": "constant_score", "slop": 10, "analyzer": "auto",
             "auto_generate_synonyms_phrase_query": "false", "fuzziness": "auto", "fuzzy_transpositions": false, "lenient": "false",
             "max_expansions": 10, "minimum_should_match": 3, "operator": "AND", "prefix_length": 20, "tie_breaker": 1.0,
             "type": "best_fields"})
@@ -1676,6 +1676,7 @@ public void testMultiMatchOptionsPushDown() {
             .autoGenerateSynonymsPhraseQuery(false)
             .operator(Operator.fromString("AND"))
             .fuzziness(Fuzziness.fromString("auto"))
+            .fuzzyRewrite("constant_score")
             .fuzzyTranspositions(false)
             .lenient(false)
             .maxExpansions(10)