Hello, We just want to have a clear understanding of the _source field. Is it going to be indexed or stored? if it is stored where it is going to be stored. As an experiment, we disabled the _source using PUT index_name/_mapping {enable=false}, and we were unable to see the source in the discovery…

[image] ksaimohan2k: We just want to have a clear understanding of the _source field. Is it going to be indexed or stored? This is explained in the documentation , the _source field is stored in the index, but it is not indexed. [image] ksaimohan2k: As an experiment, we disabled the _sour…

Thanks, @leandrojmp , for the information; it was really helpful. Just for my understanding, should I just assume that the 2.17 GB of my index is made up of the fields and the _source? For your understading, our index size was 2.17 GB when we deleted the _source, and we didn't see even a single per…

[image] ksaimohan2k: For your understading, our index size was 2.17 GB when we deleted the _source, and we didn't see even a single percent change in the storage size. How did you deleted the _source? This is a mapping changing, I'm not sure this can be changed on already existing indices or …

We just disabled the _source. PUT index_name/_mapping {enable=false} Thank you for clarifying. Your insights are appreciated.

Thanks for the info, @DavidTurner . I will look into that.

Hello @DavidTurner and @leandrojmp Just for the confirmation i am asking, can I assume that the _source (stored) and extracted fields ( indexed) are resided in the same index file? For example an index size is 2GB and it has 60 million events, if I use size plugin, it shows average size of the do…

There's no need to assume anything, just use the API I linked above.

_source field storage (_source Field Overview)

Elastic Stack Elasticsearch

DavidTurner (David Turner) August 15, 2023, 10:25am 6

If you have questions about the disk usage of individual fields in an index, it is simplest to use the analyze index disk usage API to investigate more deeply.

Topic		Replies	Views
Removing _source increases size of index Elasticsearch	3	1054	September 9, 2021
Disable _source field Elasticsearch	4	1500	June 8, 2023
Disable _source field Elasticsearch	9	6187	May 17, 2018
_source disabled Elasticsearch	10	554	May 9, 2013
Enabling/Disabling _source field query Elasticsearch	5	729	March 5, 2019

_source field storage (_source Field Overview)

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