Component templates in Elasticsearch - Mini Project: Build & Apply

Create and Use Elasticsearch Component Templates

📖 Scenario: You are managing an Elasticsearch cluster for a company that stores logs from different applications. To keep the index settings consistent, you want to use component templates to define common settings and mappings.

🎯 Goal: Build an Elasticsearch setup where you create a component template with specific settings and mappings, then create an index template that uses this component template.

📋 What You'll Learn

Create a component template named logs_settings with number_of_shards set to 1

Add a mapping in the component template for a timestamp field of type date

Create an index template named logs_template that uses the logs_settings component template

Apply the index template to indices matching logs-*

💡 Why This Matters

🌍 Real World

Component templates help keep Elasticsearch index settings and mappings consistent across many indices, especially in logging or monitoring systems.

💼 Career

Knowing how to use component and index templates is important for Elasticsearch administrators and developers to manage scalable and maintainable data indexing.

1

Create the component template with settings

Write a PUT request to create a component template called logs_settings with number_of_shards set to 1 in the settings.

Elasticsearch

# Write the PUT request to create the component template 'logs_settings' with number_of_shards 1
# Your code here

Need a hint?

Use the PUT _component_template/{name} API and include settings inside template.

2

Add a mapping for the timestamp field

Update the logs_settings component template to add a mappings section with a timestamp field of type date.

Elasticsearch

PUT _component_template/logs_settings
{
  "template": {
    "settings": {
      "number_of_shards": 1
    },
    # Add mappings here
  }
}
# Your code here

Need a hint?

Inside template, add a mappings object with properties defining the timestamp field.

3

Create an index template using the component template

Write a PUT request to create an index template called logs_template that applies to index patterns matching logs-* and uses the component template logs_settings.

Elasticsearch

PUT _component_template/logs_settings
{
  "template": {
    "settings": {
      "number_of_shards": 1
    },
    "mappings": {
      "properties": {
        "timestamp": {
          "type": "date"
        }
      }
    }
  }
}

# Write the PUT request to create the index template 'logs_template' using 'logs_settings'
# Your code here

Need a hint?

Use PUT _index_template/{name} with index_patterns and composed_of referencing the component template.

4

Verify the index template is applied

Write a GET request to retrieve the index template named logs_template and print the response.

Elasticsearch

PUT _component_template/logs_settings
{
  "template": {
    "settings": {
      "number_of_shards": 1
    },
    "mappings": {
      "properties": {
        "timestamp": {
          "type": "date"
        }
      }
    }
  }
}

PUT _index_template/logs_template
{
  "index_patterns": ["logs-*"] ,
  "composed_of": ["logs_settings"]
}

# Write the GET request to retrieve and print the 'logs_template' index template
# Your code here

Need a hint?

Use GET _index_template/{name} to see the index template details.