* stable-2.8:
Support committing Lucene writes within a fixed interval
Fix ArrayIndexOutOfBoundsException on intraline diff again
Conflicts:
gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneChangeIndex.java
Change-Id: I7b93d81d8e5c53615ef1684b653d6fa9e941d935