Fix DerivedFieldQuery to support concurrent search.

[mch2]

Description

This change updates DerivedFieldQuery to create a separate ValueFetcher instance per thread. The DerivedFieldValueFetcher is not thread safe in that it holds a ref to a compiled DerivedFieldScript that is created per thread. Each script also holds a SourceLookup object that is not thread safe.

Note there are no changes here specific to aggs with derived fields, that test already passes because we create a new ValueFetcher per leaf here.

Without this change these ITs fail with:

WARNING: Uncaught exception in thread: Thread[#170,opensearch[node_s1][search][T#1],5,TGRP-SimplePainlessIT]
java.lang.AssertionError: StoredFieldsReader are only supposed to be consumed in the thread in which they have been acquired. But was acquired in Thread[#171,opensearch[node_s1][index_searcher][T#1],5,TGRP-SimplePainlessIT] and consumed in Thread[#172,opensearch[node_s1][index_searcher][T#2],5,TGRP-SimplePainlessIT].
	at __randomizedtesting.SeedInfo.seed([77FDD1CE9C5EAC30]:0)
	at org.apache.lucene.tests.codecs.asserting.AssertingCodec.assertThread(AssertingCodec.java:44)
	at org.apache.lucene.tests.codecs.asserting.AssertingStoredFieldsFormat$AssertingStoredFieldsReader.document(AssertingStoredFieldsFormat.java:75)
	at org.opensearch.search.lookup.SourceLookup.loadSourceIfNeeded(SourceLookup.java:104)
	at org.opensearch.script.DerivedFieldScript.lambda$static$1(DerivedFieldScript.java:42)
	at org.opensearch.script.DynamicMap.get(DynamicMap.java:84)
	at org.opensearch.painless.PainlessScript$Script.execute(emit(params._source["field"]):12)
	at org.opensearch.index.mapper.DerivedFieldValueFetcher.fetchValuesInternal(DerivedFieldValueFetcher.java:54)
	at org.opensearch.index.mapper.DerivedFieldValueFetcher.getIndexableField(DerivedFieldValueFetcher.java:59)
	at org.opensearch.index.query.DerivedFieldQuery$1$1.matches(DerivedFieldQuery.java:99)

Related Issues

Resolves #15007

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❕ Gradle check result for 7cc1a6b: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[github-actions]

❌ Gradle check result for 917ebd5: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 1520b44: SUCCESS

[github-actions]

❕ Gradle check result for 2373d0f: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.