There are two parts here
- Map/reduce views. These can be directly used by SDKs/UI.
- N1QL has 3 type indexes Couchbase 7 views
Indexes based on GSI (default, USING GSI)
Indexes based on FTS (USING FTS)
Indexes based on Map/reduce view. (USING VIEW). In 7.0 N1QL Queries will not able to use this index (VIEW) functionality removed.