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Diagnose and Repair Elasticsearch Indices

When configured correctly, Elasticsearch clusters are highly available and fault tolerant. That doesn't necessarily mean they are impervious to failure. Human error and hardware failure are always a possibility. Troubleshooting data availability issues on a distributed system can be a challenge. In this hands-on lab, we will use the cluster allocation explain API to demystify the troubleshooting process of shard allocation issues in Elasticsearch.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 1h 30m
Last updated
Clock icon Aug 31, 2025

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Table of Contents

  1. Challenge

    Troubleshoot any red-state indices.

    Using the Secure Shell (SSH), log in to the data-1node ascloud_user` via the public IP address.

    Start the elasticsearch node with:

    sudo systemctl start elasticsearch

    Use the Kibana console tool to execute the following:

    PUT logs-02/_settings
{
  "number_of_replicas": 1
}

  2. Challenge

    Troubleshoot any yellow-state indices.

    Use the Kibana console tool to execute the following:

    PUT logs-01/_settings
{
  "number_of_replicas": 1
}
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Pluralsight Skills gives leaders confidence they have the skills needed to execute technology strategy. Technology teams can benchmark expertise across roles, speed up release cycles and build reliable, secure products. By leveraging our expert content, skill assessments and one-of-a-kind analytics, keep up with the pace of change, put the right people on the right projects and boost productivity. It's the most effective path to developing tech skills at scale.

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