Briefly, this error occurs when Elasticsearch is unable to parse the body of a response. This could be due to a malformed response, incorrect content type, or a bug in the Elasticsearch client. To resolve this issue, you can try the following: 1) Check the format of the response body to ensure it’s correctly formed. 2) Verify the content type of the response. It should be ‘application/json’ for Elasticsearch. 3) Update your Elasticsearch client to the latest version, as this could be a bug that’s been fixed in a newer version.
This guide will help you check for common problems that cause the log ” Error extracting body from response ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: response, reindex.
Overview
Reindex is the concept of copying existing data from a source index to a destination index which can be inside the same or a different cluster. Elasticsearch has a dedicated endpoint _reindex for this purpose. A reindexing is mostly required for updating mapping or settings.
Examples
Reindex data from a source index to destination index in the same cluster:
POST /_reindex?pretty
{
"source": {
"index": "news"
},
"dest": {
"index": "news_v2"
}
}
Notes
- Reindex API does not copy settings and mappings from the source index to the destination index. You need to create the destination index with the desired settings and mappings before you begin the reindexing process.
- The API exposes an extensive list of configuration options to fetch data from the source index, such as query-based indexing and selecting multiple indices as the source index.
- In some scenarios reindex API is not useful, where reindexing requires complex data processing and data modification based on application logic. In this case, you can write your custom script using Elasticsearch scroll API to fetch the data from source index and bulk API to index data into destination index.
Log Context
Log “Error extracting body from response” class name is RemoteScrollableHitSource.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
try {
throw new ElasticsearchException(
"Response didn't include Content-Type: " + bodyMessage(response.getEntity())
);
} catch (IOException e) {
ElasticsearchException ee = new ElasticsearchException("Error extracting body from response");
ee.addSuppressed(e);
throw ee;
}
}
// EMPTY is safe here because we don't call namedObject
