Function create_search_engine 

pub async fn create_search_engine(
    config: &SearchConfig,
    repo: Arc<PGConnection>,
    migrations: bool,
) -> Result<Arc<SearchEngineBackend>, OperationOutcomeError>

Builds the engine config describes, against repo.

migrations says whether this process is allowed to change the index’s shape. The indexing worker only ever writes documents, so it passes false and never prunes a mapping out from under the server.

Errors

Returns an error if the backend cannot be reached or configured.