Moving "entitysearch" to experimental features

Replacing the native search box with the entity selector requires some adjustments
to be done in the entity selector widget. Until these are not done, the entity
selector should not replace the search box since it will behave very different than
a regular search box.

Change-Id: I37786e885f48f0d4f80025a8835f10512ff0a7f4
Merge "Moving "entitysearch" to experimental features"