LUCENE-5373: Fix memory usage estimation for [Lucene40/Lucene42/Memory/Direct]DocValuesProducer.


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SOLR-5408: CollapsingQParserPlugin scores incorrectly when multiple sort criteria are used

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SOLR-5416: CollapsingQParserPlugin bug with tagging

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Added 4.6.1 CHANGES

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SOLR-5442: Python client cannot parse proxied response when served by Tomcat.
SOLR-5445: Proxied responses should propagate all headers rather than the first one for each key.

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SOLR-5479: SolrCmdDistributor retry logic stops if a leader for the request cannot be found in 1 second.

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SOLR-5479: Deal with null message in SolrLogLayout

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SOLR-5532: SolrJ Content-Type validation is too strict for some webcontainers / proxies.

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SOLR-5576: Improve concurrency when registering and waiting for all SolrCore's to register a DOWN state.

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SOLR-5580: NPE when creating a core with both explicit shard and coreNodeName.

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SOLR-5552: Leader recovery process can select the wrong leader if all replicas for a shard are down and trying to recover as well as lose updates that should have been recovered.
SOLR-5569 A replica should not try and recover from a leader until it has published that it is ACTIVE.
SOLR-5568 A SolrCore cannot decide to be the leader just because the cluster state says no other SolrCore's are active.

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SOLR-5569: fix how this check is done - we need to hit the rest of the loop, not continue

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merge back latest delete replica tests

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SOLR-5547: Creating a collection alias using SolrJ's CollectionAdminRequest sets the alias name and the collections to alias to the same value.

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SOLR-5552: Add CHANGES entry
SOLR-5569: Add CHANGES entry
SOLR-5568: Add CHANGES entry

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SOLR-5496: We should share an http connection manager across non search HttpClients and ensure all http connection managers get shutdown.

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SOLR-5583: ConcurrentUpdateSolrServer#blockUntilFinished may wait forever if the executor service is shutdown.

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tests: improve this test

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SOLR-5586: All ZkCmdExecutor's should be initialized with the zk client timeout

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tests: enable test

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