Simon Willnauer 29336b231b Add ref-counting to SearchContext to prevent accessing already closed readers (#20095) ... When a SearchContext is closed it's reader / searcher reference is closed too. If this happens while a search is accessing it's reader reference it can lead to an unexpected `AlreadyClosedException` or worst case, an already closed MMapDirectory is access causing a `SIGSEV` like in #20008 (even though the window for this is very small). SearchContext can be closed concurrently if: * an index is deleted / removed from the node * a search context is idle for too long and is cleaned by the reaper * an explicit freeContext message is received This change adds reference counting to the SearchContext base class and it's used inside SearchService each time the context is accessed. Closes #20008		2016-08-22 15:41:05 +02:00
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src	Add ref-counting to SearchContext to prevent accessing already closed readers (#20095)	2016-08-22 15:41:05 +02:00
build.gradle	Update to Jackson 2.8.1	2016-08-05 12:26:06 +02:00