Misleading error message when updating replication config - claims vectorizer config is immutable

[Shah91n]

Environment:

• Server: 1.31.12
• Client: Python (Latest)

Issue Description:
When attempting to update only the replication configuration (deletion strategy and async settings) for a collection, the operation fails with a misleading error message claiming the vectorizer config is immutable.

Error Message:

Failed to update configuration for collection <> : Collection configuration may not have been updated.! Unexpected status code: 422, with response body: {'error': [{'message': 'vectorizer config of vector "<>" is immutable'}]}

Code Used:

collection.config.update(
    replication_config=Reconfigure.replication(
        deletion_strategy=ReplicationDeletionStrategy.DELETE_ON_CONFLICT,
        async_enabled=True
    )
)

Expected Behavior:

• The replication configuration should be updated successfully since only replication settings are being modified
• If the operation cannot be completed, the error message should accurately reflect what's preventing the update

Actual Behavior:

• Operation fails with vectorizer immutability error despite no vectorizer changes being requested
• Error message is confusing and doesn't indicate the actual cause of the failure

[dudanogueira]

I was not able to reproduce this error on:
Client: 4.17.0, Server: 1.32.9