Raise regex timeout to 120 seconds

This will allow regex searches to spin for much much longer before
elasticsearch times them out.  The elasticsearch side timeout is 120 seconds
and the mediawiki (curl) side timeout is 240 seconds.

Bug: 67418
Change-Id: Ia96ba180a54672e730ecf00da0ccfd2c8f698ef0
Merge "Raise regex timeout to 120 seconds"