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Diagnose and Repair Elasticsearch Clusters

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 so let's take some time to demystify some basic troubleshooting routines when you notice yellow or even red indexes in your Elasticsearch cluster. In this hands-on lab, you are given the opportunity to: * Use the `_cat` APIs to quickly get vital information about your cluster * Use the `_cluster/allocation/explain` API to find out why and index is or is not allocated * Use the `_settings` API to quickly update index settings

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Path Info

Level
Clock icon Advanced
Duration
Clock icon 3h 0m
Last updated
Clock icon Aug 19, 2025

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Table of Contents

  1. Challenge

    Troubleshoot the "accounts-1" index.

    Using the Secure Shell (SSH), log in to the data-2 and data-3 nodes as cloud_user via the public IP address.

    Become the elastic user with:

    sudo su - elastic

    Start the elasticsearch node with:

    /home/elastic/elasticsearch/bin/elasticsearch -d -p pid

    Use the Kibana console tool to execute the following:

    PUT accounts-1/_settings
{
  "number_of_replicas": 3
}

  2. Challenge

    Troubleshoot the "accounts-2" index.

    Use the Kibana console tool to execute the following:

    PUT accounts-2/_settings
{
  "number_of_replicas": 3
}

  3. Challenge

    Troubleshoot the "accounts-3" index.

    Use the Kibana console tool to execute the following:

    PUT accounts-3/_settings
{
  "index.routing.allocation.exclude._name": null
}
Pluralsight Skills - Labs - Pluralsight
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Pluralsight Skills

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.

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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We will provide the credentials and environment necessary for you to practice right within your browser.

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Follow along with the author’s guided walkthrough and build something new in your provided environment!

Did you know?

On average, you retain 75% more of your learning if you get time for practice.
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