Do not disable search fields when updating results

When a search is run the search fields are disabled. This is really annoying. 

Searches take a long time to complete and TAC still often times out. This means that

• when a user loads up the page, then need to wait a minute to before they can change the fields,
• they update a first field, it auto-runs the search even though they weren't done inputting stuff and they wait another minute,
• they update a second field and it auto-runs the search,
• and the same happens for every single field.
• Then the search doesn't return satisfactory results because the user doesn't know exactly what they're looking for and they need to start from square 1. 
• rinse and repeat for every string.

This makes every single search take at round trip of >5 mins even though it could be 30 seconds. 

solution proposals:

• do not auto search. wait for the user to submit
• do not do a search on page load (that search is never going to be the thing the user was looking for anyway)
• if you want to maintain autosearch, 
  • add a debounce
  • do not disable fields so that the user can continue editing.