[9.1] Fix default index options when dimensions are unset for legacy indices #130575
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elastic#130540) In elastic#129825, we modified the dense_vector field type to delay setting index options until the field's dimensions are known. However, this introduced a discrepancy for indices created before that change, which would previously default to int8_hnsw even when dimensions were not set. This discrepancy leads to an assertion failure in mixed-version clusters, where the serialized mappings differ between nodes: ``` [2025-07-02T20:37:29,852][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [v9.0.4-2] fatal error in thread [elasticsearch[v9.0.4-2][clusterApplierService#updateTask][T#1]], exiting java.lang.AssertionError: provided source [{"_doc":{"properties":{"vector":{"type":"dense_vector","index":true,"similarity":"cosine"}}}}] differs from mapping [{"_doc":{"properties":{"vector":{"type":"dense_vector","index":true,"similarity":"cosine","index_options":{"type":"int8_hnsw","m":16,"ef_construction":100}}}}}] ``` This commit resolves the issue by ensuring that indices created before the change continue to default to int8_hnsw index options, even if dimensions remain unset.
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Backport of #130572 to 9.1