Briefly, this error occurs when Elasticsearch is unable to perform multiple operations in a single API call, typically due to insufficient resources or incorrect data formatting. To resolve this, you can increase the system resources, particularly memory, or split the bulk operation into smaller chunks. Also, ensure that the data is correctly formatted and doesn’t contain any invalid entries. If the issue persists, check the Elasticsearch logs for more specific error messages.
This guide will help you check for common problems that cause the log ” Can’t execute a bulk ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, bulk.
Overview
In Elasticsearch, when using the Bulk API it is possible to perform many write operations in a single API call, which increases the indexing speed. Using the Bulk API is more efficient than sending multiple separate requests. This can be done for the following four actions:
- Index
- Update
- Create
- Delete
Examples
The bulk request below will index a document, delete another document, and update an existing document.
POST _bulk
{ "index" : { "_index" : "myindex", "_id" : "1" } }
{ "field1" : "value" }
{ "delete" : { "_index" : "myindex", "_id" : "2" } }
{ "update" : {"_id" : "1", "_index" : "myindex"} }
{ "doc" : {"field2" : "value5"} }Notes
- Bulk API is useful when you need to index data streams that can be queued up and indexed in batches of hundreds or thousands, such as logs.
- There is no correct number of actions or limits to perform on a single bulk call, but you will need to figure out the optimum number by experimentation, given the cluster size, number of nodes, hardware specs etc.
Log Context
Log “Can’t execute a bulk” class name is BulkShardRequestInterceptor.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
boolean dls = indexAccessControl.getDocumentPermissions().hasDocumentLevelPermissions();
// the feature usage checker is a "last-ditch" verification; it doesn't have practical importance
if ((fls || dls) && licenseChecker.get()) {
found = true;
logger.trace("aborting bulk item update request for index [{}]"; bulkShardRequest.index());
bulkItemRequest.abort(bulkItemRequest.index(); new ElasticsearchSecurityException("Can't execute a bulk " +
"item request with update requests embedded if field or document level security is enabled";
RestStatus.BAD_REQUEST));
}
}
if (found == false) {
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