Merge branch 'master' into feature/stabilization
WIKI-566 fix NPE in SessionDestroyedListener
WIKI-748: TC-4.0.3 [Unified Search] Slowness in WikiSearchServiceConnector.search

WIKI-748: TC-4.0.3 [Unified Search] Slowness in WikiSearchServiceConnector.search

WIKI-748: TC-4.0.3 [Unified Search] Slowness in WikiSearchServiceConnector.search

WIKI-748: Fix missing of excerpt content

Conflicts:

	wiki-service/src/main/java/org/exoplatform/wiki/service/search/WikiSearchData.java
WIKI-748: TC-4.0.3 [Unified Search] Slowness in WikiSearchServiceConnector.search

WIKI-748: TC-4.0.3 [Unified Search] Slowness in WikiSearchServiceConnector.search

WIKI-748: TC-4.0.3 [Unified Search] Slowness in WikiSearchServiceConnector.search

WIKI-748: Fix missing of excerpt content

Conflicts:

	wiki-service/src/main/java/org/exoplatform/wiki/service/search/WikiSearchData.java
Merge feature/stabilization into master branch
Merge branch 'master' into feature/social-notifications