[Backport 2.x] Integrates KNN plugin with ConcurrentSearchRequestDecider interface (… #2126
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…#2111)
This allows knn queries to enable concurrency when index.search.concurrent_segment_search.mode or search.concurrent_segment_search.mode in auto mode. Without this the default behavior of auto mode is non-concurrent search
Signed-off-by: Tejas Shah [email protected]
(cherry picked from commit 0421cdc)
Description
Backport for #2111
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