CORE-5177 Fixed search timestamp units.

Search results and queries now use milliseconds for date created and modified timestamps.
Also replaced debug logging in the SearchServiceFacadeImpl with KLUDGE comments.
(cherry picked from commit 295f6e7059a971ae464880f9df76726f045616a6)
CORE-5177 Fixed DataSearchQueryBuilderTest.
(cherry picked from commit 19ba0e7ee2d1168d69b363463c35c5056fcb8acf)