Motivation
The C driver does not support the batchSize option on the listIndexes helper: mongoc_collection_find_indexes_with_opts.

The attachment includes a reproduction script. It is not possible to pass a batch size to the initial listIndexes command.

The Enumerate Indexes specification does note this behavior is optional:

MAY allow the cursor.batchSize option to be passed.

Scope

Accept a batchSize as a top-level option, which applies to both the initial listIndexes command and all getMore operations.