[jdk21u-dev] RFR: 8318082: ConcurrentModificationException from IndexWriter [v2]

[Aleksey Shipilev]

> Unclean backport to fix a customer-visible bug in Javadoc tool. The uncleanliness comes from the missing refactoring ([JDK-8309566](https://bugs.openjdk.org/browse/JDK-8309566), that looks unnecessary to backport.
> 
> Maybe @jonathan-gibbons and @pavelrappo want to take a look.
> 
> Additional testing:
>  - [x] New test fails without the product fix, passes with it
>  - [x] `jdk/javadoc` still passes

Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into JDK-8318082-cme-indexwriter
 - Backport fc29a2e152310ed81bd1bb23e6f17d02f055a454

-------------

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/23/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/23/files/fb40d3da..d7f22a8a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=23&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=23&range=00-01

  Stats: 15513 lines in 425 files changed: 7057 ins; 2659 del; 5797 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/23.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/23/head:pull/23

PR: https://git.openjdk.org/jdk21u-dev/pull/23