How To Solve Issues Related to Log – Unable to clear scroll id :

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Troubleshooting Background – start here to get the full picture       
Related Issues – selected resources on related issues  
Log Context – usefull for experts
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Troubleshooting background

To troubleshoot Elasticsearch log “Unable to clear scroll id :” it’s important to know common problems related to Elasticsearch concepts: delete, delete-by-query, deletebyquery, plugins, scroll. See below-detailed explanations complete with common problems, examples and useful tips.

DELETE Elasticsearch API

What is it

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.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

Why does this ElasticSearch scan and scroll keep returning the same scroll id?
stackoverflow.com/questions/25453872/why-does-this-elasticsearch-scan-and-scroll-keep-returning-the-same-scroll-id

Number of Views : 9.29 K  Score on Stackoverflow : 22

Clearing A Scroll During Scan And S
discuss.elastic.co/t/clearing-a-scroll-during-scan-and-scroll/42080

 


Log Context

Log ”Unable to clear scroll id :” classname is TransportDeleteByQueryAction.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                             logger.trace("scroll id [{}] cleared"; scrollId);
                        }

                        
Override
                        public void onFailure(Throwable e) {
                            logger.warn("unable to clear scroll id [{}]: {}"; scrollId; e.getMessage());
                        }
                    });
                }

                if (failure != null) {





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