Send empty vector index type on new Weavaite versions

[dirkkul]

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[orca-security-eu]

Orca Security Scan Summary

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[Copilot]

Pull request overview

This PR updates collection schema creation so that for newer Weaviate servers (>= 1.37.4) the client can omit vectorIndexType in (named) vector configs, letting the server apply its own default vector index type, while preserving the existing HNSW default behavior for older servers.

Changes:

• Add server-version-gated behavior in CollectionsExecutor.create() to decide whether to emit the client-side default vectorIndexType.
• Thread a new emit_default_vector_index_type option through _CollectionConfigCreate._to_dict() and into named/default vector config _to_dict() implementations.
• Conditionally omit vectorIndexType when no explicit vector index config is provided and the flag is disabled.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
weaviate/collections/collections/executor.py	Computes the version-gated flag and passes it into config serialization during collection creation.
weaviate/collections/classes/config.py	Adds flag plumbing to collection config serialization and conditionally emits top-level default vectorIndexType.
weaviate/collections/classes/config_vectors.py	Allows omitting vectorIndexType for (default) vector configs when no explicit index config is set.
weaviate/collections/classes/config_named_vectors.py	Allows omitting vectorIndexType for named vector configs when no explicit index config is set.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.76%. Comparing base (78fa5f7) to head (26b13fc).
⚠️ Report is 166 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2042      +/-   ##
==========================================
- Coverage   87.95%   86.76%   -1.20%     
==========================================
  Files         280      299      +19     
  Lines       21664    22931    +1267     
==========================================
+ Hits        19054    19895     +841     
- Misses       2610     3036     +426     

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