# Time-series data out of order
**URL:** https://discuss.elastic.co/t/time-series-data-out-of-order/349741
**Category:** Elasticsearch
**Created:** [December 20, 2023, 4:54pm UTC](https://discuss.elastic.co/t/time-series-data-out-of-order/349741 "2023-12-20T16:54:21Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@lkw](https://discuss.elastic.co/u/lkw)
#### Post date: [December 20, 2023, 4:54pm UTC](https://discuss.elastic.co/t/time-series-data-out-of-order/349741/1 "2023-12-20T16:54:21Z")
I have a data stream in use for some custom application logs. There are about 10 months of logs in it and a handful of rolled-over backing indices.
I also have about 3 years worth of historic application logs that I'd like to 'prepend' to this data stream. Is it okay to upload (drastically) out of order logs into the active data stream? Or is reindexing everything into a new data stream my only option?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [January 17, 2024, 4:55pm UTC](https://discuss.elastic.co/t/time-series-data-out-of-order/349741/2 "2024-01-17T16:55:11Z")
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