Full Text Search query with spaces

I have set up FTS on my buckets and when trying to search for queries that have spaces, I’ve found it returns more than what I want.

Here is an example:
On an index I search the following: “+field: Key Word”. What I want it to return is any document in that bucket that contains “Key Word” exactly in the field “field”, however it returns documents that have just “Key” or “Word” or “Key Word” in the field “field”, which is not what I want to return.

Any ideas if this is possible or a different way to do this?
Thank you