Is Full-Text Search based on Lucene?

[Stennie_X (Stennie)]

@Shayan_Test

Is Atlas Search available on non-cloud MongoDB?

Hi,

Atlas Search is currently not available on-prem. There is a relevant feature request you can watch and upvote: Atlas Search: support on-prem installations.

@Shayan_Test

Why are there two different text search types for MongoDB (Atlas Search, Text Search). Which one is preferable?

Atlas Search is a cloud-first initiative which provides more comprehensive search features for MongoDB Atlas users without any additional installation & management requirements. If you are a MongoDB Atlas user with advanced search requirements (and a MongoDB 4.2+ cluster), I would consider using Atlas Search.

However, Atlas Search does add some resource overhead because there are additional processes and storage requirements for the Lucene integration. See: Atlas Search Performance Considerations.

If you are not using Atlas (or have more basic text search requirements) you can use standard Text Search.

@Shayan_Test

Can both of the text search types index data that are spread across different shards?

Yes, both of these text search indexes support sharded clusters.

Regards,
Stennie