DRIVERS-2549 fix typo of `ListSearchIndexOptions`; add missing `definition` argument

[kevinAlbs]

Please complete the following before merging:

• Update changelog.
• Make sure there are generated JSON files from the YAML test files.
• Test changes in at least one language driver.
• Test these changes against all server versions and topologies (including standalone, replica set, sharded clusters, and serverless).

[kevinAlbs]

Will be addressed in https://github.com/mongodb/specifications/pull/1442