Ensure multivalues are sorted (#119457)

Author: idegtiarenko

muted-tests.yml

@@ -241,9 +241,6 @@ tests:
 - class: org.elasticsearch.xpack.test.rest.XPackRestIT
   method: test {p0=ml/data_frame_analytics_cat_apis/Test cat data frame analytics all jobs with header}
   issue: https://github.com/elastic/elasticsearch/issues/119332
-- class: org.elasticsearch.xpack.esql.qa.multi_node.EsqlSpecIT
-  method: test {lookup-join.MvJoinKeyOnTheDataNode ASYNC}
-  issue: https://github.com/elastic/elasticsearch/issues/119179
 - class: org.elasticsearch.smoketest.SmokeTestMultiNodeClientYamlTestSuiteIT
   issue: https://github.com/elastic/elasticsearch/issues/119191
 - class: org.elasticsearch.xpack.logsdb.qa.LogsDbVersusLogsDbReindexedIntoStandardModeChallengeRestIT
@@ -252,9 +249,6 @@ tests:
 - class: org.elasticsearch.xpack.logsdb.qa.LogsDbVersusLogsDbReindexedIntoStandardModeChallengeRestIT
   method: testMatchAllQuery
   issue: https://github.com/elastic/elasticsearch/issues/119432
-- class: org.elasticsearch.xpack.esql.qa.multi_node.EsqlSpecIT
-  method: test {lookup-join.MvJoinKeyOnTheDataNode SYNC}
-  issue: https://github.com/elastic/elasticsearch/issues/119446
 - class: org.elasticsearch.xpack.logsdb.qa.LogsDbVersusLogsDbReindexedIntoStandardModeChallengeRestIT
   method: testTermsQuery
   issue: https://github.com/elastic/elasticsearch/issues/119486

x-pack/plugin/esql/qa/testFixtures/src/main/resources/lookup-join.csv-spec

@@ -419,6 +419,7 @@ FROM employees
 | EVAL language_code = emp_no % 10
 | LOOKUP JOIN languages_lookup_non_unique_key ON language_code
 | SORT emp_no
+| EVAL language_name = MV_SORT(language_name)
 | KEEP emp_no, language_code, language_name
 ;