Update lucene to 5.5.4 and Elasticsearch to 2.4.5
Update lucene to 5.5.4 and Elasticsearch to 2.4.5

Lucene version 5.5.4 includes several bug fixes [1].

We need to upgrade Elasticsearch at the same time because it has a hard
runtime dependency on the Lucene version. Version 2.4.5 of Elasticsearch
uses Lucene 5.5.4.

[1] https://lucene.apache.org/core/5_5_4/changes/Changes.html

Change-Id: I03bf09c1170db2a57b2e90722898920c2fbe4aaf

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