This updates to the latest bug fix version of Lucene 7, which is version 7.7.3. Since it is only an update to the micro version, there is no need to regenerate the index. See [UPDATING-lucene.txt](https://github.com/openjdk/jfx/blob/master/apps/samples/Ensemble8/UPDATING-lucene.txt).
------------- Commit messages: - 8260246: Ensemble: Update version of Lucene to 7.7.3 Changes: https://git.openjdk.java.net/jfx/pull/387/files Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=387&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8260246 Stats: 9 lines in 5 files changed: 0 ins; 0 del; 9 mod Patch: https://git.openjdk.java.net/jfx/pull/387.diff Fetch: git fetch https://git.openjdk.java.net/jfx pull/387/head:pull/387 PR: https://git.openjdk.java.net/jfx/pull/387
