Briefly, this error occurs when you try to forcefully delete a datafeed in Elasticsearch while the datafeed task is still running. The system doesn’t support this action as it could lead to data inconsistency or loss. To resolve this issue, you can first stop the datafeed task using the ‘stop datafeed API’ and then proceed with the deletion. Alternatively, you can use the ‘delete datafeed API’ with the ‘force’ parameter set to ‘false’ to ensure the datafeed is only deleted when it’s not running.
This guide will help you check for common problems that cause the log ” Force delete datafeed is not supported because the datafeed task ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, delete, task.
Overview
DELETE is an Elasticsearch API which removes a document from a specific index. This API requires an index name and _id document to delete the document.
Delete a document
DELETE /my_index/_doc/1
Notes
- A delete request throws 404 error code if the document does not already exist in the index.
- If you want to delete a set of documents that matches a query, you need to use delete by query API.
Overview
A task is an Elasticsearch operation, which can be any request performed on an Elasticsearch cluster, such as a delete by query request, a search request and so on. Elasticsearch provides a dedicated Task API for the task management which includes various actions, from retrieving the status of current running tasks to canceling any long running task.
Examples
Get all currently running tasks on all nodes of the cluster
Apart from other information, the response of the below request contains task IDs of all the tasks which can be used to get detailed information about the particular task in question.
GET _tasks
Get detailed information of a particular task
Where clQFAL_VRrmnlRyPsu_p8A:1132678759 is the ID of the task in below request
GET _tasks/clQFAL_VRrmnlRyPsu_p8A:1132678759
Get all the current tasks running on particular nodes
GET _tasks?nodes=nodeId1,nodeId2
Cancel a task
Where clQFAL_VRrmnlRyPsu_p8A:1132678759 is the ID of the task in the below request
POST /_tasks/clQFAL_VRrmnlRyPsu_p8A:1132678759/_cancel?pretty
Notes
- The Task API will be most useful when you want to investigate the spike of resource utilization in the cluster or want to cancel an operation.
Log Context
Log “Force delete datafeed is not supported because the datafeed task” class name is TransportIsolateDatafeedAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} String executorNode = datafeedTask.getExecutorNode();
DiscoveryNodes nodes = state.nodes();
if (nodes.resolveNode(executorNode).getVersion().before(Version.V_5_5_0)) {
listener.onFailure(new ElasticsearchException("Force delete datafeed is not supported because the datafeed task " +
"is running on a node [" + executorNode + "] with a version prior to " + Version.V_5_5_0));
return;
} request.setNodes(datafeedTask.getExecutorNode());
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