Hi, I am running a ES 6.3 on a single node fed by fscrawler 2.4 on a fileshare. It was working fine for few days but suddenly there was an issue that certain keywords would give a timeout (searched using kibana 6.3) or a no response (.NET client using ES6.3 rest service).
I am really perplexed as to the cause, the node has 40 shards of which 5 are unallocated, thus health is showing yellow.
My questions are :
a) has the index been corrupted? is there a way to check that ?
b) if so, can it be recovered ?
c) what are the reasons that can lead to such corruption of index and how to avoid them?
thanks in advance.