Add FORK generator back (#129790)

Author: ioanatia

x-pack/plugin/esql/qa/server/src/main/java/org/elasticsearch/xpack/esql/qa/rest/generative/EsqlQueryGenerator.java

@@ -14,6 +14,7 @@
 import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.DropGenerator;
 import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.EnrichGenerator;
 import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.EvalGenerator;
+import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.ForkGenerator;
 import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.GrokGenerator;
 import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.KeepGenerator;
 import org.elasticsearch.xpack.esql.qa.rest.generative.command.pipe.LimitGenerator;
@@ -55,8 +56,7 @@ public record QueryExecuted(String query, int depth, List<Column> outputSchema,
         DropGenerator.INSTANCE,
         EnrichGenerator.INSTANCE,
         EvalGenerator.INSTANCE,
-        // Awaits fix: https://github.com/elastic/elasticsearch/issues/129715
-        // ForkGenerator.INSTANCE,
+        ForkGenerator.INSTANCE,
         GrokGenerator.INSTANCE,
         KeepGenerator.INSTANCE,
         LimitGenerator.INSTANCE,