Engine is already closed – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.7-2.9

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Briefly, this error occurs when an operation is attempted on an OpenSearch index that has been closed. Closing an index is a way to free up resources, but it also means that you can’t perform operations like search or update on it. To resolve this issue, you can either reopen the index using the Open Index API, or if the index is no longer needed, you can delete it using the Delete Index API. Alternatively, ensure that your application logic doesn’t attempt operations on closed indices.

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This guide will help you check for common problems that cause the log ” Engine is already closed. ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Engine is already closed.” classname is InternalEngine.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        return new GatedCloseable(segmentInfos; () -> {
            try {
            } catch (AlreadyClosedException e) {
                logger.warn("Engine is already closed."; e);



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