Frequently Asked Questions

Can I run partial string matching Atlas Search queries?

Yes. The following Atlas Search operators support partial string matching queries:

• autocomplete
• wildcard
• regex

Can I perform case-insensitive search with the wildcard or regex operator?

Yes. You can use the wildcard and regex operators with a custom analyzer to perform a case-insensitive search. You can define a custom analyzer with the following tokenizer and token filter to perform a wildcard case-insensitive search:

• keyword tokenizer
• lowercase token filter

Does storedSource support case-insensitive collation on fields?

Yes. The Atlas Search storedSource option stores original values. To perform case-insensitive operations after the $search stage on the results returned using returnStoredSource option, you must set the default collation strength of your collection to 1 or 2 when you create it, and must not specify a different collation in your queries and indexes.

Can I use the shard key to run Atlas Search queries on specific shard(s)?

No, you can't use the shard key to run Atlas Search queries on a specific shard or a subset of shards. In a sharded cluster environment, Atlas Search queries are scatter-gather queries that run on all the shards.