This is how _source works. doc_values don't make sense in this regard - what you are looking for is using stored fields and have the transform script write to that. Loading stored fields (even one field per hit) may be slower than loading and parsing _source, though.
I'd just put this logic in the indexer, though. It will definitely help with other things as well, such as nasty huge mappings. Alternatively, find a way to avoid IO completely. How about using ES for search and something like riak for loading the actual data, if IO costs are so noticable? -- Itamar Syn-Hershko http://code972.com | @synhershko <https://twitter.com/synhershko> Freelance Developer & Consultant Lucene.NET committer and PMC member On Mon, Apr 20, 2015 at 11:18 PM, Itai Frenkel <itaifren...@live.com> wrote: > Hi, > > We are having a performance problem in which for each hit, elasticsearch > parses the entire _source then generates a new Json with only the requested > query _source fields. In order to overcome this issue we would like to use > mapping transform script that serializes the requested query fields (which > is known in advance) into a doc_value. Does that makes sense? > > The actual problem with the transform script is SecurityException that > does not allow using any json serialization mechanism. A binary > serialization would also be ok. > > > Itai > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to elasticsearch+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elasticsearch/b897aba2-c250-4474-a03f-1d2a993baef9%40googlegroups.com > <https://groups.google.com/d/msgid/elasticsearch/b897aba2-c250-4474-a03f-1d2a993baef9%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to elasticsearch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/CAHTr4Zsmri8LvzAqnXrwCA7B2PesCtH05BQxmj%3D3vMr%2B9abikw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
