[8.18] Prevent field caps from failing due to can match failure (#134134)#134558
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dimitris-athanasiou merged 5 commits intoelastic:8.18from Sep 11, 2025
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) `FieldCapabilitiesFetcher` performs a can-match in order to quickly return an empty response if no shard can match. However, if can-match fails for some reason, it can cause the field capabilities request to fail. An example of that is when a semantic query is used as filter. can-match will fail as it won't be able to expand the inference results of the query. In cases like that, it makes no sense to fail the field capabilities request. Instead, we should treat can-match as returning `true` to proceed. This change does that by following suit with other callers of can-match. Fixes elastic#116106 (cherry picked from commit 7295189) # Conflicts: # x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferenceFeatures.java # x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/queries/SemanticQueryBuilder.java # x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/10_semantic_text_field_mapping.yml # x-pack/plugin/inference/src/yamlRestTest/resources/rest-api-spec/test/inference/10_semantic_text_field_mapping_bwc.yml
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