Failed to decompress source – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to decompress the source data. This could be due to corrupted data, a bug in the decompression software, or a mismatch between the compression algorithm used to compress the data and the one used to decompress it. To resolve this issue, you could try re-indexing the data, ensuring that the correct decompression algorithm is being used, or checking for bugs in the decompression software. If the data is corrupted, you may need to restore it from a backup.

This guide will help you check for common problems that cause the log ” failed to decompress source ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search, source.

Log Context

Log “failed to decompress source” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try {
 this.source = CompressorFactory.uncompressIfNeeded(this.source);
 return this.source;
 } catch (IOException e) {
 throw new ElasticsearchParseException("failed to decompress source"; e);
 }  /**
 * Sets representation; might be compressed....