Where's my data gone?

We have a small Elastic Search cluster consisting of 3 nodes.
Looking back at some historic data that we are holding it would appear that
some of our data is missing.

This histogram below shows 2 50 minute periods where the number of events
is noticeably lower.
This wasn't the case when I last looked at this data a couple of days ago.

Our index has 5 primary shards, 10 active shards and 0 unassigned shards.

We have tried...

  • Flushing the index
  • Refreshing the index
  • Clearing the cache
  • Restarting the nodes
    ...but nothing has had an effect

Does anyone have any recommendations about what might have happened or how
we can go about debugging this?

Many thanks, Chris

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