Bug 542774: [R-Help] Update help index to Lucene 7.5.0

  - Improve locking of index
  - Add async search to R help hover to avoid issues with Lucene index
    when using NIO based directory

Change-Id: I6d38057bc7a7c4faaab10607acbe6d5f2791bf3f
30 files changed
tree: 81c3e8936eb4d0f58569ce124a6d3bd1d6104805
  1. .settings/
  2. r/
  3. redocs/
  4. rhelp/
  5. rtm/
  6. .project
  7. pom.xml