Not sure what you mean/are saying. On one hand, it reads like you're asking about a 7 field composite index; on the other, some sort of index for a query that just happens to have 7 fields. Too many indexes can actually slow down performance.
Then there is the "list view" comment. Does that mean this is about SharePoint?
Maybe this will help?
https://www.fmsinc.com/free/NewTips/...ndex/index.asp
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.