Remove 126026 from ALLOWED_ERRORS

Author: kanoshiou

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

@@ -54,7 +54,6 @@ public abstract class GenerativeRestTest extends ESRestTestCase {
         "token recognition error at: '``", // https://github.com/elastic/elasticsearch/issues/125870
         "Unknown column \\[.*\\]", // https://github.com/elastic/elasticsearch/issues/126026
         "optimized incorrectly due to missing references", // https://github.com/elastic/elasticsearch/issues/116781
-        "No matches found for pattern", // https://github.com/elastic/elasticsearch/issues/126418
         "The incoming YAML document exceeds the limit:" // still to investigate, but it seems to be specific to the test framework
     );