[8.19] ESQL: Prevent search functions work with a non-STANDARD index (#130638) #130704
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This introduces verifications to prevent search functions work on fields introduced by a LOOKUP JOIN righthand-side index.
This should be a temporary fix until we can either push these filters down also on the righthand-side of a JOIN or have these functions execute within the engine.
Closes #130561 Closes #129778
(cherry picked from commit 5c4d17d)