disable ReplaceStringCasingWithInsensitiveRegexMatch rule in 8.19 (#131387)

This PR disables the ReplaceStringCasingWithInsensitiveRegexMatch rule for 8.19, originally added with #128919
This is due to Lucene missing support for Unicode CASE_INSENSITIVE automation. If we allow the pushdown, we end up with wrong data in the vase majority of the cases when Unicode characters are involved.
#131386 is logged for a complete fix and to reenable the change

Author: julian-elastic

docs/changelog/131387.yaml

@@ -0,0 +1,5 @@
+pr: 131387
+summary: Disable `ReplaceStringCasingWithInsensitiveRegexMatch` rule in 8.19
+area: ES|QL
+type: bug
+issues: []

muted-tests.yml

@@ -411,4 +411,4 @@ tests:
     issue: https://github.com/elastic/elasticsearch/issues/126085
   - class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
     method: test {yaml=reference/search/retriever/line_906}
-    issue: https://github.com/elastic/elasticsearch/issues/131041
+    issue: https://github.com/elastic/elasticsearch/issues/131041

x-pack/plugin/esql/qa/testFixtures/src/main/resources/where-like.csv-spec

@@ -874,3 +874,16 @@ emp_no:integer |first_name:keyword
 10001          |Georgi
 10055          |Georgy
 ;
+
+rlikeWithLowerTurnedInsensitiveUnicode#[skip:-8.12.99]
+FROM airport_city_boundaries
+| WHERE TO_UPPER(region) RLIKE ".*Л.*" and abbrev == "FRU"
+| KEEP region
+| LIMIT 1
+;
+
+region:text
+Свердлов району
+;
+
+

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/LocalLogicalPlanOptimizer.java

@@ -9,7 +9,6 @@
 
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.PropagateEmptyRelation;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceStatsFilteredAggWithEval;
-import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceStringCasingWithInsensitiveRegexMatch;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.local.InferIsNotNull;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.local.InferNonNullAggConstraint;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.local.LocalPropagateEmptyRelation;
@@ -75,7 +74,8 @@ private static Batch<LogicalPlan> localOperators() {
         }
 
         // add rule that should only apply locally
-        newRules.add(new ReplaceStringCasingWithInsensitiveRegexMatch());
+        // Waiting on https://github.com/elastic/elasticsearch/issues/131386
+        // newRules.add(new ReplaceStringCasingWithInsensitiveRegexMatch());
 
         return operators.with(newRules.toArray(Rule[]::new));
     }

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

@@ -646,6 +646,7 @@ public void testIsNotNullOnCase_With_IS_NULL() {
      * \_Filter[RLIKE(first_name{f}#4, "VALÜ*", true)]
      *   \_EsRelation[test][_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gen..]
      */
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testReplaceUpperStringCasinqgWithInsensitiveRLike() {
         var plan = localPlan("FROM test | WHERE TO_UPPER(TO_LOWER(TO_UPPER(first_name))) RLIKE \"VALÜ*\"");
 
@@ -660,6 +661,7 @@ public void testReplaceUpperStringCasinqgWithInsensitiveRLike() {
     }
 
     // same plan as above, but lower case pattern
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testReplaceLowerStringCasingWithInsensitiveRLike() {
         var plan = localPlan("FROM test | WHERE TO_LOWER(TO_UPPER(first_name)) RLIKE \"valü*\"");
 
@@ -677,6 +679,7 @@ public void testReplaceLowerStringCasingWithInsensitiveRLike() {
      * LocalRelation[[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gender{f}#5, hire_date{f}#10, job{f}#11, job.raw{f}#12, langu
      *   ages{f}#6, last_name{f}#7, long_noidx{f}#13, salary{f}#8],EMPTY]
      */
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testReplaceStringCasingAndRLikeWithLocalRelation() {
         var plan = localPlan("FROM test | WHERE TO_LOWER(TO_UPPER(first_name)) RLIKE \"VALÜ*\"");
 
@@ -685,6 +688,7 @@ public void testReplaceStringCasingAndRLikeWithLocalRelation() {
     }
 
     // same plan as in testReplaceUpperStringCasingWithInsensitiveRLike, but with LIKE instead of RLIKE
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testReplaceUpperStringCasingWithInsensitiveLike() {
         var plan = localPlan("FROM test | WHERE TO_UPPER(TO_LOWER(TO_UPPER(first_name))) LIKE \"VALÜ*\"");
 
@@ -699,6 +703,7 @@ public void testReplaceUpperStringCasingWithInsensitiveLike() {
     }
 
     // same plan as above, but lower case pattern
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testReplaceLowerStringCasingWithInsensitiveLike() {
         var plan = localPlan("FROM test | WHERE TO_LOWER(TO_UPPER(first_name)) LIKE \"valü*\"");
 
@@ -716,6 +721,7 @@ public void testReplaceLowerStringCasingWithInsensitiveLike() {
      * LocalRelation[[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gender{f}#5, hire_date{f}#10, job{f}#11, job.raw{f}#12, langu
      *   ages{f}#6, last_name{f}#7, long_noidx{f}#13, salary{f}#8],EMPTY]
      */
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testReplaceStringCasingAndLikeWithLocalRelation() {
         var plan = localPlan("FROM test | WHERE TO_LOWER(TO_UPPER(first_name)) LIKE \"VALÜ*\"");
 

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

@@ -2230,6 +2230,7 @@ private void doTestPushDownCaseChangeRegexMatch(String query, String expected) {
         assertThat(stripThrough(singleValue.toString()), is(stripThrough(expected)));
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testPushDownLowerCaseChangeRLike() {
         doTestPushDownCaseChangeRegexMatch("""
             FROM test
@@ -2255,6 +2256,7 @@ public void testPushDownLowerCaseChangeRLike() {
             """);
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testPushDownUpperCaseChangeRLike() {
         doTestPushDownCaseChangeRegexMatch("""
             FROM test
@@ -2280,6 +2282,7 @@ public void testPushDownUpperCaseChangeRLike() {
             """);
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testPushDownLowerCaseChangeLike() {
         doTestPushDownCaseChangeRegexMatch("""
             FROM test
@@ -2303,6 +2306,7 @@ public void testPushDownLowerCaseChangeLike() {
             """);
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testPushDownUpperCaseChangeLike() {
         doTestPushDownCaseChangeRegexMatch("""
             FROM test
@@ -2338,6 +2342,7 @@ public void testPushDownUpperCaseChangeLike() {
      *           \_FieldExtractExec[first_name{f}#5, emp_no{f}#4]<[],[]>
      *             \_EsQueryExec[test], indexMode[standard], query[][_doc{f}#26], limit[], sort[] estimatedRowSize[332]
      */
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/131041")
     public void testChangeCaseAsInsensitiveWildcardLikeNotPushedDown() {
         var esql = """
             FROM test