Global Search API CE without Elasticsearch

CE issue tracking CE version of https://gitlab.com/gitlab-org/gitlab-ee/issues/2245.
In particular, this covers the case, when there is no Elasticsearch. See details in https://gitlab.com/gitlab-org/gitlab-ee/issues/2245.

Edited Jan 08, 2018 by Victor Wu

	
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