ES|QL: Enable score function in release builds (#136988)

Author: ioanatia

docs/changelog/136988.yaml

@@ -0,0 +1,5 @@
+pr: 136988
+summary: Enable score function in release builds
+area: ES|QL
+type: feature
+issues: []

docs/reference/query-languages/esql/_snippets/functions/layout/score.md

@@ -53,6 +53,9 @@ for information on the limitations of full text search.
 :::{include} ../_snippets/functions/layout/qstr.md
 :::
 
+:::{include} ../_snippets/functions/layout/score.md
+:::
+
 % TERM is currently a hidden feature
 % To make it visible again, uncomment this and the line in
 lists/search-functions.md

docs/reference/query-languages/esql/functions-operators/search-functions.md

@@ -14,7 +14,6 @@
 import org.elasticsearch.plugins.Plugin;
 import org.elasticsearch.xpack.esql.VerificationException;
 import org.elasticsearch.xpack.esql.action.AbstractEsqlIntegTestCase;
-import org.elasticsearch.xpack.esql.action.EsqlCapabilities;
 import org.elasticsearch.xpack.kql.KqlPlugin;
 import org.junit.Before;
 
@@ -30,7 +29,6 @@ public class ScoreFunctionIT extends AbstractEsqlIntegTestCase {
 
     @Before
     public void setupIndex() {
-        assumeTrue("can run this only when score() function is enabled", EsqlCapabilities.Cap.SCORE_FUNCTION.isEnabled());
         createAndPopulateIndex();
     }
 

docs/reference/query-languages/esql/kibana/definition/functions/score.json

@@ -1123,7 +1123,7 @@ public enum Cap {
         /**
          * score function
          */
-        SCORE_FUNCTION(Build.current().isSnapshot()),
+        SCORE_FUNCTION,
 
         /**
          * Support for the SAMPLE command

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/plugin/ScoreFunctionIT.java

@@ -526,7 +526,8 @@ private static FunctionDefinition[][] functions() {
                 def(Match.class, tri(Match::new), "match"),
                 def(MultiMatch.class, MultiMatch::new, "multi_match"),
                 def(QueryString.class, bi(QueryString::new), "qstr"),
-                def(MatchPhrase.class, tri(MatchPhrase::new), "match_phrase") },
+                def(MatchPhrase.class, tri(MatchPhrase::new), "match_phrase"),
+                def(Score.class, uni(Score::new), "score") },
             // time-series functions
             new FunctionDefinition[] {
                 defTS(Rate.class, Rate::new, "rate"),
@@ -559,7 +560,6 @@ private static FunctionDefinition[][] snapshotFunctions() {
                 def(Delay.class, Delay::new, "delay"),
                 def(First.class, bi(First::new), "first"),
                 def(Last.class, bi(Last::new), "last"),
-                def(Score.class, uni(Score::new), Score.NAME),
                 def(Term.class, bi(Term::new), "term"),
                 def(CosineSimilarity.class, CosineSimilarity::new, "v_cosine"),
                 def(DotProduct.class, DotProduct::new, "v_dot_product"),

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

@@ -15,7 +15,6 @@
 import org.elasticsearch.compute.operator.ScoreOperator;
 import org.elasticsearch.index.IndexMode;
 import org.elasticsearch.index.query.QueryBuilder;
-import org.elasticsearch.xpack.esql.action.EsqlCapabilities;
 import org.elasticsearch.xpack.esql.capabilities.PostAnalysisPlanVerificationAware;
 import org.elasticsearch.xpack.esql.capabilities.PostOptimizationPlanVerificationAware;
 import org.elasticsearch.xpack.esql.capabilities.PostOptimizationVerificationAware;
@@ -211,8 +210,7 @@ private static void checkFullTextQueryFunctions(LogicalPlan plan, Failures failu
                     failures.add(
                         fail(
                             ftf,
-                            "[{}] {} is only supported in WHERE and STATS commands"
-                                + (EsqlCapabilities.Cap.SCORE_FUNCTION.isEnabled() ? ", or in EVAL within score(.) function" : ""),
+                            "[{}] {} is only supported in WHERE and STATS commands or in EVAL within score(.) function",
                             ftf.functionName(),
                             ftf.functionType()
                         )

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

@@ -25,13 +25,11 @@ public static List<NamedWriteableRegistry.Entry> getNamedWriteables() {
         entries.add(MultiMatch.ENTRY);
         entries.add(Kql.ENTRY);
         entries.add(MatchPhrase.ENTRY);
+        entries.add(Score.ENTRY);
 
         if (EsqlCapabilities.Cap.TERM_FUNCTION.isEnabled()) {
             entries.add(Term.ENTRY);
         }
-        if (EsqlCapabilities.Cap.SCORE_FUNCTION.isEnabled()) {
-            entries.add(Score.ENTRY);
-        }
         if (EsqlCapabilities.Cap.DECAY_FUNCTION.isEnabled()) {
             entries.add(Decay.ENTRY);
         }

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

@@ -47,7 +47,7 @@ public class Score extends Function implements EvaluatorMapper {
     @FunctionInfo(
         returnType = "double",
         preview = true,
-        appliesTo = { @FunctionAppliesTo(lifeCycle = FunctionAppliesToLifecycle.DEVELOPMENT) },
+        appliesTo = { @FunctionAppliesTo(lifeCycle = FunctionAppliesToLifecycle.PREVIEW, version = "9.3.0") },
         description = "Scores an expression. Only full text functions will be scored. Returns scores for all the resulting docs.",
         examples = { @Example(file = "score-function", tag = "score-function") }
     )