# Whenever I index the data, index size is different even though I set the same config and mapping
**URL:** https://discuss.elastic.co/t/whenever-i-index-the-data-index-size-is-different-even-though-i-set-the-same-config-and-mapping/17612
**Category:** Elasticsearch
**Created:** [May 20, 2014, 6:39am UTC](https://discuss.elastic.co/t/whenever-i-index-the-data-index-size-is-different-even-though-i-set-the-same-config-and-mapping/17612 "2014-05-20T06:39:36Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Telax](https://discuss.elastic.co/u/Telax)
#### Post date: [May 20, 2014, 6:39am UTC](https://discuss.elastic.co/t/whenever-i-index-the-data-index-size-is-different-even-though-i-set-the-same-config-and-mapping/17612/1 "2014-05-20T06:39:36Z")
I would expect that it is because data is being distributed among shards and nodes differently automatically as you're using randomly generated ID's for your documents. Compression levels will always vary depending upon the data - you could have 100 consecutive rows with almost identical data giving good compression on one run but the next run they could be highly fragmented.
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### Author:  [@jprante](https://discuss.elastic.co/u/jprante)
#### Post date: [May 20, 2014, 8:26am UTC](https://discuss.elastic.co/t/whenever-i-index-the-data-index-size-is-different-even-though-i-set-the-same-config-and-mapping/17612/2 "2014-05-20T08:26:22Z")
Have you set up shards = 1 / replica = 0 for your index to disable random
shard distribution by doc ID, and did you execute curl
'0:9200/yourindexname/\_optimize?max\_num\_segments=1' after indexing to pack
all segments?
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Then you should see comparable results.
Jörg
On Tue, May 20, 2014 at 3:23 AM, [ellie.suh@nexr.com](mailto:ellie.suh@nexr.com) wrote:
> whenever I index the data, index size is different even though I set the
> same config and mapping.
> What happen to Elastic Search? Anybody knows about it? Please give me
> hint...
>
> 1.
>
> - tokenizer : standard
> - index compression : true
> - size of index : 2.78G
>
> 1.
>
> - tokenizer : standard
> - index compression : true
> - size of index : 3.00G
>
> 3
>
> - tokenizer : standard
> - index compression : true
> - size of index : 2.89G
>
> ==============================
> 1.
>
> - tokenizer : standard
> - source compression : true
> - size of index : 3.12G
>
> 1.
>
> - tokenizer : standard
> - source compression : true
> - size of index : 2.76G
>
> 1.
>
> - tokenizer : standard
> -source compression : true
> - size of index : 2.91G
>
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### Author:  [@jihyun\_suh](https://discuss.elastic.co/u/jihyun_suh)
#### Post date: [May 21, 2014, 8:22am UTC](https://discuss.elastic.co/t/whenever-i-index-the-data-index-size-is-different-even-though-i-set-the-same-config-and-mapping/17612/3 "2014-05-21T08:22:27Z")
thanks~
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 1:27am UTC](https://discuss.elastic.co/t/whenever-i-index-the-data-index-size-is-different-even-though-i-set-the-same-config-and-mapping/17612/4 "2017-07-06T01:27:56Z")