ESQL: Unmute some generative tests (#131446)

The corresponding issue #116781 has already been fixed.

Author: alex-spies

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

@@ -48,7 +48,6 @@ public abstract class GenerativeRestTest extends ESRestTestCase {
         // Awaiting fixes for query failure
         "Unknown column \\[<all-fields-projected>\\]", // https://github.com/elastic/elasticsearch/issues/121741,
         "Plan \\[ProjectExec\\[\\[<no-fields>.* optimized incorrectly due to missing references", // https://github.com/elastic/elasticsearch/issues/125866
-        "optimized incorrectly due to missing references", // https://github.com/elastic/elasticsearch/issues/116781
         "The incoming YAML document exceeds the limit:", // still to investigate, but it seems to be specific to the test framework
         "Data too large", // Circuit breaker exceptions eg. https://github.com/elastic/elasticsearch/issues/130072