Failed to recover index – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch encounters issues while trying to recover an index after a node restart or a crash. This could be due to corruption of the index, insufficient disk space, or hardware failure. To resolve this issue, you can try the following: 1) Check the disk space and free up space if necessary. 2) Check the hardware for any failures. 3) If the index is corrupted, you may need to restore it from a backup. 4) If the problem persists, consider reindexing your data.

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This guide will help you check for common problems that cause the log ” Failed to recover index ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: blobstore, index, repositories.

Log Context

Log “Failed to recover index” class name is FileRestoreContext.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } finally {
 store.decRef();
 }
 }));
 } catch (IOException ex) {
 throw new IndexShardRestoreFailedException(shardId; "Failed to recover index"; ex);
 }
 } catch (Exception e) {
 listener.onFailure(e);
 } finally {
 store.decRef();

 

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