Impossible to set custom `HYBRID_SEARCH_WEIGHTS` value

[qbey]

Bug Report

Problematic behavior
Impossible to set custom HYBRID_SEARCH_WEIGHTS value. When set in environment variable, the index creation fails with class_cast_exception: class java.lang.String cannot be cast to class java.lang.Double on OpenSearch.

Expected behavior/code
The HYBRID_SEARCH_WEIGHTS must be casted to a list of floats before being sent to OpenSearch in ensure_search_pipeline_exists.

Steps to Reproduce

1. set a value for HYBRID_SEARCH_WEIGHTS
2. run ensure_search_pipeline_exists
3. look at open search logs

Environment

• Version: main (as of 2026-02-27)
• Platform:

Possible Solution
Force cast of setting value.