Search improvements

[raveneous]

What I have added/changed is:

• postpone search
• correct fulltext search
• size of search query from default value to 1000

The goal of my change is:

-postpone search in order to not blown up elasticsearch with unfinished queries

• correct fulltext search, so you can search as expected
• size of search query from default value to 1000 to get all results

What I have tested about my change is:

All

As noted in commit message, maybe take into consideration ability to select search size from web interface.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@df55177). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master   #2390   +/-   ##
========================================
  Coverage          ?     62%           
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  Files             ?     152           
  Lines             ?   15177           
  Branches          ?       0           
========================================
  Hits              ?    9410           
  Misses            ?    5767           
  Partials          ?       0

Impacted Files	Coverage Δ
cuckoo/web/analysis/views.py	24.89% <ø> (ø)

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[coveralls]

Coverage remained the same at 61.949% when pulling e6cd1a3 on raveneous:master into c41c7c5 on cuckoosandbox:master.