Customizing Field Mappings

Elasticsearch is smart! It often guesses your data types when you index a document (this is called dynamic mapping). But sometimes, you need more precise control.

Explicit mappings let you define exactly how each field in your documents should be stored and indexed. This is crucial for optimal search behavior, efficient storage, and accurate aggregations.

A mapping acts like a schema for your index. You typically define it when you create a new index. It lives within the "mappings" object in your index creation request.

Here's the basic structure:

PUT /my_new_index
{
  "mappings": {
    "properties": {
      "your_field_name": {
        "type": "field_type_here"
      }
    }
  }
}

The "properties" object holds all your field definitions.