Fix + unmute SampleTests (#127959)

Author: jan-elastic

muted-tests.yml

@@ -462,12 +462,6 @@ tests:
 - class: org.elasticsearch.indices.stats.IndexStatsIT
   method: testThrottleStats
   issue: https://github.com/elastic/elasticsearch/issues/126359
-- class: org.elasticsearch.xpack.esql.expression.function.aggregate.SampleTests
-  method: testGroupingAggregate {TestCase=<long unicode KEYWORDs>}
-  issue: https://github.com/elastic/elasticsearch/issues/127950
-- class: org.elasticsearch.xpack.esql.expression.function.aggregate.SampleTests
-  method: testGroupingAggregate {TestCase=<long unicode TEXTs>}
-  issue: https://github.com/elastic/elasticsearch/issues/127951
 - class: org.elasticsearch.search.vectors.IVFKnnFloatVectorQueryTests
   method: testRandomWithFilter
   issue: https://github.com/elastic/elasticsearch/issues/127963

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/aggregate/SampleTests.java

@@ -50,12 +50,12 @@ public static Iterable<Object[]> parameters() {
                 MultiRowTestCaseSupplier.booleanCases(1, 1000),
                 MultiRowTestCaseSupplier.ipCases(1, 1000),
                 MultiRowTestCaseSupplier.versionCases(1, 1000),
-                MultiRowTestCaseSupplier.stringCases(1, 1000, DataType.KEYWORD),
-                MultiRowTestCaseSupplier.stringCases(1, 1000, DataType.TEXT),
+                MultiRowTestCaseSupplier.stringCases(1, 20, DataType.KEYWORD),
+                MultiRowTestCaseSupplier.stringCases(1, 20, DataType.TEXT),
                 MultiRowTestCaseSupplier.geoPointCases(1, 1000, MultiRowTestCaseSupplier.IncludingAltitude.NO),
                 MultiRowTestCaseSupplier.cartesianPointCases(1, 1000, MultiRowTestCaseSupplier.IncludingAltitude.NO),
-                MultiRowTestCaseSupplier.geoShapeCasesWithoutCircle(1, 100, MultiRowTestCaseSupplier.IncludingAltitude.NO),
-                MultiRowTestCaseSupplier.cartesianShapeCasesWithoutCircle(1, 100, MultiRowTestCaseSupplier.IncludingAltitude.NO)
+                MultiRowTestCaseSupplier.geoShapeCasesWithoutCircle(1, 20, MultiRowTestCaseSupplier.IncludingAltitude.NO),
+                MultiRowTestCaseSupplier.cartesianShapeCasesWithoutCircle(1, 20, MultiRowTestCaseSupplier.IncludingAltitude.NO)
             )
                 .flatMap(List::stream)
                 .map(fieldCaseSupplier -> makeSupplier(fieldCaseSupplier, limitCaseSupplier))