Query: Fixes default for the query plan optimization for Hybrid Search to be disabled #5174
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This is a cherry-pick of #5171
Description
#5120 enabled the switch to ask for the optimized query plan by default. However, the pipeline support for the optimized query plan is in #5121. This will lead to exceptions in the hybrid search query pipeline in version 3.49.0 if the SDK talks to a newer gateway that can return the optimized query plan. To prevent this, we change this optimization to be disabled by default.
Type of change