The engine suites keep what is engine-specific (index setup, health, purge-space batching); every behavior answer lives in the parity suite once. The shared test client learns IndicesCount, and FIELDS-15 pins the Size/Type gate for number queries.
The Mtime field is mapped as an OpenSearch `date`, which rejects an
empty value with `mapper_parsing_exception: cannot parse empty date`.
The folder and root fixtures had no Mtime, so serializing them to
`"Mtime": ""` made TestEngine_Purge/purge_resource_trees fail when the
document was indexed. Give both a valid RFC3339 Mtime, matching the
file fixture.
both engines now agree on names, titles, tags, paths, types, sizes, dates,
hidden flags, facet values and wildcards. quotes only delimit phrases and
the equals operator matches the whole field value, following the kql spec.
the index name carries a generation so a changed mapping starts on a fresh
index, MIGRATION.md says how to fill it.
Move the OpenSearch test helpers to services/search/internal/opensearchtest so
the parity package can import them, and drop the index generation and clock
patch the suite was written against, neither exists on main yet.
Dominik Schmidt