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

[Kevin Rushforth]

On Tue, 4 Feb 2020 16:39:22 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 chages:
> 
> 1. Bumped the version numbers from 7.7.1 to 7.7.2 in all needed places
> 2. Regenerated the index files. I used JDK 11.x to do this (out of an abundance of caution, not because I think it matters).
> 
> 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?

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