Ignoring dangled index on node due to an existing alias with the same name – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

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Briefly, this error occurs when an Elasticsearch index and an alias share the same name. This can cause confusion as Elasticsearch wouldn’t know whether to refer to the index or the alias. To resolve this issue, you can either rename the index or the alias to avoid the name clash. Alternatively, you can delete the dangled index if it’s no longer needed. Another solution is to remove the alias and recreate it with a different name. It’s important to ensure unique names for indices and aliases to avoid such conflicts.

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This guide will help you check for common problems that cause the log ” ignoring dangled index [{}] on node [{}] due to an existing alias with the same name ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: alias, index, node, dangled.

Log Context

Log “ignoring dangled index [{}] on node [{}] due to an existing alias with the same name” classname is LocalAllocateDangledIndices.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        }
                        if (currentState.metadata().hasIndex(indexMetadata.getIndex().getName())) {
                            continue;
                        }
                        if (currentState.metadata().hasAlias(indexMetadata.getIndex().getName())) {
                            logger.warn("ignoring dangled index [{}] on node [{}] due to an existing alias with the same name";
                                    indexMetadata.getIndex(); request.fromNode);
                            continue;
                        }
                        if (currentState.metadata().indexGraveyard().containsIndex(indexMetadata.getIndex())) {
                            logger.warn("ignoring dangled index [{}] on node [{}] since it was recently deleted";

 

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