[8.x] ESQL: Ignore multivalued key columns in lookup index on JOIN (#120726) #121037
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…#120726) Fixes elastic#118780 Second part of elastic#120519 In the first PR, we avoid matching multivalue keys in lookup when they come from the query. Now, we avoid matching multivalues when the lookup index has multivalues in the key column.
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Backports the following commits to 8.x: