Try upgrading Elasticsearch -- it's up to 6.0 release just a few week ago
now -- its (and Lucene's) memory usage has decreased over time.
The _uid field in particular will always be costly, unfortunately. Since
it's a primary key, every term will be unique, and the term index has to
work hard to
Comments below:
On Tue, Nov 28, 2017 at 4:47 PM, elirev wrote:
> Thanks Mike .
> I did not find any clear way to know it its FST or Norm , or something
> else ( unless i miss something ) the fact the FST is an in memory prefix
> index lead me to think it using most of the heap .
> Our
Hi elirev,
The field "index" of class "org.apache.lucene.codecs.blocktree.FieldReader"
is the fst of each field; its type is FST. I close a index and
pick a shard; wirte some code to directly read the shard and then use the
reflection to get the actual fst object of _uid field. The ramBytesUsed()
