Fork LRUQueryCache from Lucene to work around LUCENE-7749 #24207
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Lucene 6.5.1 is likely going to be released too late for it to be included
in Elasticsearch 5.4. Yet we are interested in one bug fix it contains:
https://issues.apache.org/jira/browse/LUCENE-7749, which allows the query
cache to work with
IndexOrDocValuesQuery
, the new query that we use for rangequeries.