ALTER INDEX for replica count never builds the index when executed from a query plan

When using ALTER INDEX with "action": "replica_count" to add an index replica, i.e.:

ALTER INDEX `def_inventory_hotel_url` ON `travel-sample`.`inventory`.`hotel` WITH {"action":"replica_count","num_replica":1}

Typically, the newly added replica is automatically built and becomes ready. However, I was recently testing an upgrade of couchbase-index-manager to use the 4.x release of the NodeJS SDK. This version of the SDK, by default, executes queries with a prepared query plan. So a query plan is generated, and then the query plan is executed, rather than executing the queries directly.

In this case, where a query plan is used, the replica is not being built automatically. It just remains in the "created" state in the UI. Additionally, attempting to use a BUILD INDEX command to build the index manually doesn't work because the primary replica is already built.

The workaround, in the case of the NodeJS SDK, is to ensure that

is passed with the ALTER INDEX query so it doesn't create a query plan and instead executes the query directly. However, this seems like something that may easily trip up others and a bug on the server side.