When I filter using the Discover tab, I cannot focus my data.
If I want to search for 'Member Type A' in a particular field, I get results containing other Member Types in that field, like 'Member Type B', 'Member Type C', with the Member Type I searched for at the very top of the results.
The search bar simply exposes lucene query syntax, and I don't believe it's possible to do exact value searches with lucene without some extra effort at indexing time.
However, elasticsearch and kibana provide the ability to filter on exact matches. If you expand any of the documents, you'll see all of the fields listed. Find the field you want to filter on and click the + sign to add it as a filter. If you need to, you can edit the raw filter itself by mousing over the filter and clicking the edit icon.
Here's a short screencast for adding a filter from a doc:
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