"index_options"="docs" option and its relation with disk space

Elastic Stack Elasticsearch
1

Inside Tuning for Disk Space i have read something about index_options parameter.

For my use case i currently have the default set. I have tried setting this parameter to "docs", which is not supposed to generate term freq and positional offsets.
I have seen below behaviors:

  1. If i check /_termvectors for my fields after setting to "docs". I can see "term_freq", "position", "start_offset", "end_offset" values are generated :roll_eyes:
  2. But while searching i observe that the above parameters are not considered in calculating score. This is ok and works as expected.

Query:
If all the values above are always generated (even though not used while searching), how is "docs" going to save space on disk or in memory ?

2

Any lead on this topic please?

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