Could not obtain %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.7-8.9

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Briefly, this error occurs when Elasticsearch is unable to obtain a shard due to issues like network problems, insufficient resources, or incorrect configurations. To resolve this, you can check your network connectivity, ensure that your Elasticsearch cluster has enough resources (CPU, memory, disk space), and verify your shard allocation settings. If the issue persists, consider reindexing your data or increasing the number of shards.

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This guide will help you check for common problems that cause the log ” could not obtain %s ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “could not obtain %s” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    var writer = new OutputStreamWriter(stream; StandardCharsets.UTF_8)
                ) {
            } catch (Exception e) {
                logger.error(format("could not obtain %s"; prefix); e);
            } finally {


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