RFR: 8238434: Ensemble: Update version of Lucene to 7.7.2

[Kevin Rushforth]

On Tue, 4 Feb 2020 16:41:20 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> Update the version of Lucene used by Ensemble to the latest release of Lucene 7 which is version 7.7.2.
>> 
>> Per the instructions in [`UPDATING-lucene.txt`](https://github.com/openjdk/jfx/blob/master/apps/samples/Ensemble8/UPDATING-lucene.txt), I made the following changes:
>> 
>> 1. Bumped the version numbers from 7.7.1 to 7.7.2 in all needed places
>> 
>> I did not regenerated the index files, since only the `bugfix` number (the third digit) changed. It is the same `major.minor` release as before.
>> 
>> To test this: apply the patch, run `gradle apps`, launch Ensemble8, and search for a sample or JavaFX component in the upper-right search box.
> 
> @aghaisas can you review this?

I pushed a new commit that reverts the changes to the stored binary index files. There is no need to regenerate them when upgrade to a new version where only the `bugfix` number (the third digit) changes. This minimizes the churn and avoids modifying the binary index files needlessly. I added a note to this effect in the updated [`UPDATING-lucene.txt`](https://github.com/openjdk/jfx/blob/6facff5d7b7a9160939a5b4231a8355a617377a6/apps/samples/Ensemble8/UPDATING-lucene.txt) file.

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PR: https://git.openjdk.java.net/jfx/pull/105