_uid size_in_bytes optimization

Hi! I use elasticsearch 5.2.1 to store, search and aggregate timeseries data of network connections. Index is about 35Gb per day, single type and contans no more than 10 fields which are strong typed. When I analyzed segments info of an index I found that most memory usage (size_in_bytes) belongs to _uid field which I do not use directly.
I tried to play with id generators but do not see much savings. So is there any plan to optimize _uid field heap memory consuption (for example move it to numeric form) or completely disable it?

Yep, it's actively under discussion (a blocker for 6.0 actually). See: https://github.com/elastic/elasticsearch/issues/25240 and https://github.com/elastic/elasticsearch/issues/11887

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