High disk watermark exceeded even when there is not much data in my index

Question

I\'m using elasticsearch on my local machine. The data directory is only 37MB in size but when I check logs, I can see:

[2015-05-17 21:31:12,905][WARN

Answer 1

Its a warning and won't affect anything. The storage processors (SPs) use high and low watermarks to determine when to flush their write caches. The possible solution can be to free some memory

And the warning will disappear. Even with it showing, the replicas will not be assigned to the node which is okay. The elasticsearch will work fine.