Index Templates

Index Templates

# Create a template (applied when new index matches pattern)
PUT /_index_template/logs-template
{
  "index_patterns": ["logs-*"],
  "template": {
    "settings": {
      "number_of_shards": 1,
      "number_of_replicas": 1,
      "index.lifecycle.name": "logs-policy"
    },
    "mappings": {
      "properties": {
        "timestamp": { "type": "date" },
        "level":     { "type": "keyword" },
        "message":   { "type": "text" },
        "host":      { "type": "keyword" }
      }
    }
  },
  "priority": 100
}

# New index matching logs-* gets these settings automatically
PUT /logs-2024-01