wohali commented on issue #1552: I need help with some queries
URL: https://github.com/apache/couchdb/issues/1552#issuecomment-412078912
   Exactly what @detroitenglish said - `$regex` will always do a full database 
scan. You can tell your query isn't using an index by making the same query 
against the `/dbname/_explain` endpoint, which will show which indexes are 
being used (and, I believe in 2.2, warns about the `$regex` operator...but I 
might be wrong.)
   Your options are:
   1. Create partial indexes using `$regex` and then query those with exact 
   1. Use `$or` to search each of the fields via an exact, `$eq` based approach
   1. Consider using the `$in` operator, but keep in mind this will still have 
to fully scan all documents in an index (thus, being faster than `$regex`, but 
will be slower than an exact-based search)
   1. Build a custom CouchDB that includes the dreyfus/clouseau support (which 
is Apache Lucene based) and do a full-text search using the `$text` operator
   Hopefully one of these options will help.

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