Fastest way to get all documents of a type

Couchbase Server
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Just a general question. Using .NET sdk 2.5.2 and need to query a bucket to retrieve all documents where the ID contains ‘FD’.
Currently I have a N1QL query

SELECT * FROM Features WHERE META().id LIKE "%:FD%"

and using QueryAsync to execute it as I can’t find another method such as the GetAsync for individual document ID’s.
Just wondering would this be the best approach to use or is there an alternative? As I know from reading that there is a performance difference between using the N1QL over the get methods.