# Diff out all documents with the same hash key in 2 (or more) test runs
**URL:** https://discuss.elastic.co/t/diff-out-all-documents-with-the-same-hash-key-in-2-or-more-test-runs/105124
**Category:** Elasticsearch
**Created:** [October 24, 2017, 8:38pm UTC](https://discuss.elastic.co/t/diff-out-all-documents-with-the-same-hash-key-in-2-or-more-test-runs/105124 "2017-10-24T20:38:57Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Siegfried\_Hauenstein](https://discuss.elastic.co/u/Siegfried_Hauenstein)
#### Post date: [October 24, 2017, 8:38pm UTC](https://discuss.elastic.co/t/diff-out-all-documents-with-the-same-hash-key-in-2-or-more-test-runs/105124/1 "2017-10-24T20:38:57Z")
Hi Folks,
I am pretty new to elastic search pattern and wonder if you can give me any hint if this is possible what I want.
- I collect system logs over daily regression tests.
- I generate a normalized hash key for every syslog payload which does not contain any dynamic number.
- I tag all syslog traces with a "run" tag. Lets say "run1" and "run2"
Now I want to find the "difference" between the 2 runs and visualize it in kibana.
My pseudo filter code looks like:
filter out all elements with:
( document.hash (document.version) == document.hash(document.versionB) )
Is this possible with a filter rule?
Any hint is appreciated.
Kind regards
Siggi
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 21, 2017, 8:41pm UTC](https://discuss.elastic.co/t/diff-out-all-documents-with-the-same-hash-key-in-2-or-more-test-runs/105124/2 "2017-11-21T20:41:10Z")
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