# Indexing/search algorithm stability between versions
**URL:** https://discuss.elastic.co/t/indexing-search-algorithm-stability-between-versions/301718
**Category:** Elasticsearch
**Created:** [April 6, 2022, 8:14am UTC](https://discuss.elastic.co/t/indexing-search-algorithm-stability-between-versions/301718 "2022-04-06T08:14:22Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Alvaro\_Denis\_Acosta](https://discuss.elastic.co/u/Alvaro_Denis_Acosta)
#### Post date: [April 6, 2022, 8:14am UTC](https://discuss.elastic.co/t/indexing-search-algorithm-stability-between-versions/301718/1 "2022-04-06T08:14:22Z")
Hello @all,
I'm migrating from Elasticsearch 1.5 to 7.10 there are multiple required changes, the most relevant one is the removal of the document type concept in version 6, to deal with it I introduced a new field "doc\_type" and then I match with it when I search.
My question is, when I make the same (or equivalent because there are some changes) search query should I expect to have the exact same result set? Because I'm having some differences, so I would like to figure out if I broke something in the new mappings or in the search query.
Thank you in advance
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 6, 2022, 8:14am UTC](https://discuss.elastic.co/t/indexing-search-algorithm-stability-between-versions/301718/2 "2022-04-06T08:14:22Z")
Elasticsearch 1.5 is [EOL](https://www.elastic.co/support/eol) and no longer supported. Please upgrade ASAP.
(This is an automated response from your friendly Elastic bot. Please report this post if you have any suggestions or concerns :elasticheart: )
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 4, 2022, 8:14am UTC](https://discuss.elastic.co/t/indexing-search-algorithm-stability-between-versions/301718/3 "2022-05-04T08:14:23Z")
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