# Index "failed to merge"
**URL:** https://discuss.elastic.co/t/index-failed-to-merge/5660
**Category:** Elasticsearch
**Created:** [October 22, 2011, 3:02pm UTC](https://discuss.elastic.co/t/index-failed-to-merge/5660 "2011-10-22T15:02:17Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@Kenneth\_Loafman\_2](https://discuss.elastic.co/u/Kenneth_Loafman_2)
#### Post date: [October 22, 2011, 3:02pm UTC](https://discuss.elastic.co/t/index-failed-to-merge/5660/1 "2011-10-22T15:02:17Z")
Hi,
We're got the following problem on the 15th:
[2011-10-15 16:10:19,023][WARN][index.merge.scheduler] [Rand, Daniel]
[co0181ca0607][0] failed to merge
org.apache.lucene.index.CorruptIndexException: docs out of order (221 \<= 221
)
at
org.apache.lucene.index.FormatPostingsDocsWriter.addDoc(FormatPostingsDocsWriter.java:84)
at
org.apache.lucene.index.SegmentMerger.appendPostings(SegmentMerger.java:590)
at
org.apache.lucene.index.SegmentMerger.mergeTermInfos(SegmentMerger.java:538)
at
org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:470)
at
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:109)
at
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4273)
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3917)
at
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:388)
at
org.apache.lucene.index.TrackingConcurrentMergeScheduler.doMerge(TrackingConcurrentMergeScheduler.java:88)
at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:456)
After that, it's just a one line warning message ever so often.
We have 2 shards and one replica, so the data should be safe, right?
How do I fix this?
...Thanks,
...Ken
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 3:51am UTC](https://discuss.elastic.co/t/index-failed-to-merge/5660/2 "2017-07-06T03:51:09Z")