[9.0] ESQL: Unmute test and reuse blockFactory to avoid concurrently modifying the test factories list (#128211) #128242
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…ing the test factories list (elastic#128211) Fixes elastic#128092 The error happens inside an ArrayList.add(), and it's a concurrency-related one. The stacktrace is quite explicative: ``` java.lang.ArrayIndexOutOfBoundsException: Index 34 out of bounds for length 33 at java.util.ArrayList.add(ArrayList.java:485) at org.elasticsearch.compute.test.ComputeTestCase.blockFactory(ComputeTestCase.java:62) at org.elasticsearch.compute.aggregation.GroupingAggregatorFunctionTestCase$4$1$1.addBlock(GroupingAggregatorFunctionTestCase.java:659) ``` We were creating new blockFactories() inside the aggregator, which was being called concurrently with different drivers. As `blockFactory()` adds it to a static ArrayList, it was sometimes throwing. The bug only affects tests. Potentially, all grouping aggregators tests.
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Manual 9.0 backport of #128211