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

[Ajit Ghaisas]

On Tue, 4 Feb 2020 22:41:37 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> @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 upgrading 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.

I applied this patch, built the apps and verified with Ensemble8 app.
Also, verified that it downloads lucene 7.7.2 during build.

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