[Content connectors] Connector setup workflow does not allow configurable index settings #3920
Description
During the initial setup for a content connector, it performs several actions, including creating an index. The user is given the opportunity to choose the connector type and name, but no opportunity to make any changes to how the index is created.
The index will be created with a connector- prefix, followed by the connector name the user chose.
If that index already exists, the setup workflow will fail on the index already exists error, so the user is unable to provide an existing index with their desired settings.
If it does not, the index is created with default settings. Some settings, such as index.mode, are create time only settings, and can't be altered later.
This causes the user to need to do awkward workarounds such as letting the index be created, and then deleting and recreating it at the same name prior to proceeding to connect their connector instance and continue with configuration.