Problem Statement/Rationale

Updating a vector search index definition raises an error ""mappings" is required". PyMongo raises the same error when using the update_search_index function

Steps to Reproduce

Create a vector search index definition. Edit the definition (for example add a filter field). Save the definition.

Expected Results

The vector search index definition should be updated as described in the documentation

Actual Results

An error ""mappings" is required" is raised