java - How much is the overhead of an Elastic search empty index? -


i have cluster single node. machine has 8 gb ram , es process assigned 6 gb ram. have total of 531 shards (522 indices) running on node. of shards contain no data.

here stats:

total documents: 265743

deleted documents: 27069

total size: 136923957 bytes (130.5 mb)

fielddata: 250632 bytes

filter_cache: 9984 bytes

segments: (total:82 memory_in_bytes: 3479988)

heap committed 5.9 gb , used 5.6 gb.

if create few more indices in cluster node stats doing gc , goes oom. know there lot of faults in configuration (only 1 node, 6 gb given out of 8 gb).

i want know how memory being used up. total document, filter cache, field data add nothing, still using memory.

in personal experience es 1.x , 2.x per shard overhead not trivial , in range of few mb/shard. understand it, memory reserved indexing buffers, state metadata, references lucene objects, caching objects, etc.

basically bit of memory reserved able index , start caching if needed. don't know how of still true in 5.x version.


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