# Allocation Failed

**URL:** <https://discuss.elastic.co/t/allocation-failed/342167>\
**Category:** Elasticsearch\
**Created:** [September 2, 2023, 1:12pm UTC](https://discuss.elastic.co/t/allocation-failed/342167 "2023-09-02T13:12:59Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [September 4, 2023, 6:05am UTC](https://discuss.elastic.co/t/allocation-failed/342167/4 "2023-09-04T06:05:58Z")

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I suspect you have hit [the bug described in this thread](https://discuss.elastic.co/t/when-the-number-of-documents-exceeds-2-billion-the-index-status-becomes-red/341461) as you are running a very old version that has been EOL a long time. As mentioned in the thread you probably need to restore that index from a snapshot to recover it. Once that is done you should look to upgrade.

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_[View the full topic](https://discuss.elastic.co/t/allocation-failed/342167)._