# Index status changed from yellow to red

**URL:** <https://discuss.elastic.co/t/index-status-changed-from-yellow-to-red/202349>\
**Category:** Elasticsearch\
**Created:** [October 4, 2019, 1:38pm UTC](https://discuss.elastic.co/t/index-status-changed-from-yellow-to-red/202349 "2019-10-04T13:38:59Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Nilesh\_Pasalkar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nilesh_pasalkar/32/55135_2.png) [@Nilesh\_Pasalkar](https://discuss.elastic.co/u/Nilesh_Pasalkar)\
**Post date:** [October 4, 2019, 1:38pm UTC](https://discuss.elastic.co/t/index-status-changed-from-yellow-to-red/202349/1 "2019-10-04T13:38:59Z")

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Hello Guys,

I am creating one application where I am inserting large number of documents in batches into index. initially it starts ok but after some time randomly it gives me error like below....

org.apache.lucene.index.MergePolicy$MergeException: org.apache.lucene.index.CorruptIndexException: checksum failed (hardware problem?) : expected=bc409394 actual=871ee4a (resource=BufferedChecksumIndexInput(MMapIndexInput(path="D:\ElasticSearch\6.3.0\data\nodes\0\indices\7nfiBRnwQLas8zQKOW4rGQ\0\index\_1eo.cfs") [slice=\_1eo\_Lucene50\_0.tim]))  
at org.elasticsearch.index.engine.InternalEngine$EngineMergeScheduler$2.doRun(InternalEngine.java:2113) [elasticsearch-6.3.0.jar:6.3.0]  
at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:724) [elasticsearch-6.3.0.jar:6.3.0]  
at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-6.3.0.jar:6.3.0]  
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.8.0\_221]  
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.8.0\_221]  
at java.lang.Thread.run(Unknown Source) [?:1.8.0\_221]  
Caused by: org.apache.lucene.index.CorruptIndexException: checksum failed (hardware problem?) : expected=bc409394 actual=871ee4a (resource=BufferedChecksumIndexInput(MMapIndexInput(path="D:\ElasticSearch\6.3.0\data\nodes\0\indices\7nfiBRnwQLas8zQKOW4rGQ\0\index\_1eo.cfs") [slice=\_1eo\_Lucene50\_0.tim]))  
at org.apache.lucene.codecs.CodecUtil.checkFooter(CodecUtil.java:419) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.codecs.CodecUtil.checksumEntireFile(CodecUtil.java:526) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.codecs.blocktree.BlockTreeTermsReader.checkIntegrity(BlockTreeTermsReader.java:309) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsReader.checkIntegrity(PerFieldPostingsFormat.java:348) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.codecs.perfield.PerFieldMergeState$FilterFieldsProducer.checkIntegrity(PerFieldMergeState.java:271) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.codecs.FieldsConsumer.merge(FieldsConsumer.java:96) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsWriter.merge(PerFieldPostingsFormat.java:164) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:230) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:115) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4443) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4083) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:624) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]  
at org.elasticsearch.index.engine.ElasticsearchConcurrentMergeScheduler.doMerge(ElasticsearchConcurrentMergeScheduler.java:99) ~[elasticsearch-6.3.0.jar:6.3.0]  
at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:661) ~[lucene-core-7.3.1.jar:7.3.1 ae0705edb59eaa567fe13ed3a222fdadc7153680 - caomanhdat - 2018-05-09 09:27:24]

Could you please help me why this can happen, please guide me in which direction I should look into?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [November 1, 2019, 1:39pm UTC](https://discuss.elastic.co/t/index-status-changed-from-yellow-to-red/202349/2 "2019-11-01T13:39:01Z")

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