When I repeat the same search over and over again I get somewhat wild
fluctuations in run time:  4ms, 4ms, 87ms, 17ms, 157ms, 4ms, 4ms, 4ms

Any ideas what might cause this?  This only seems to happen on my
production cluster so I'm not likely to be able to make full reproduction
steps.  I causing it with a simple match query without any filters or
anything.

Normally I trace performance stuff by causing lots of traffic and looking
at hot_threads but that these fluctuations don't feel like they'd be easy
to catch that way.

I have 16 nodes on real hardware with somewhat slow disks and 30GB heaps
with 96GB total ram.  We write to the indexes constantly but slowly.  Maybe
2-3 updates (not new docs, changes to old docs) per second per shard.

Any ideas would be great,

Thanks

Nik

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