# Delta aggregation of incremental data?

**URL:** <https://discuss.elastic.co/t/delta-aggregation-of-incremental-data/32661>\
**Category:** Elasticsearch\
**Created:** [October 21, 2015, 10:58am UTC](https://discuss.elastic.co/t/delta-aggregation-of-incremental-data/32661 "2015-10-21T10:58:13Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![maniel](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/maniel/32/5380_2.png) [@maniel](https://discuss.elastic.co/u/maniel)\
**Post date:** [October 21, 2015, 10:58am UTC](https://discuss.elastic.co/t/delta-aggregation-of-incremental-data/32661/1 "2015-10-21T10:58:13Z")

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Hi  
I'm collecting data about disk space usage, basically it's result of `df /|awk 'NR==2 { print $4 }'` (free space in bytes), so the value is decreasing through time in this example, is there any way to process those data so i have some statistic about how given numerical field changine over time, so i can visualize changes for example in kibana or even query value's net change in given time

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 5, 2017, 11:43pm UTC](https://discuss.elastic.co/t/delta-aggregation-of-incremental-data/32661/2 "2017-07-05T23:43:37Z")

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