What is the syntax for Elasticsearch aggregation queries?

The syntax for Elasticsearch aggregation queries involves using the aggregation query API to construct the aggregation query request. The syntax for aggregation queries mainly includes the following few parts:

1. Aggregation Type: Specifies the type of aggregation operation to be performed, such as summing, calculating averages, counting, etc.
2. Field: specifies the fields to be aggregated.
3. Bucket: Used for grouping data, allows data to be divided into different buckets based on the values of a field.
4. Metric: Used for calculating the data within buckets, such as summing the data in each bucket, calculating the average, etc.

Here is a simple syntax example for an aggregate query:

{
  "aggs": {
    "bucket_name": {
      "aggregation_type": {
        "field": "field_name"
      }
    }
  }
}

In this case, “aggs” is the keyword for aggregation query, “bucket_name” refers to the name of the bucket, “aggregation_type” is the type of aggregation operation, and “field_name” is the field that needs to be aggregated.

It is important to note that the basic syntax for aggregation queries above can be expanded upon by adding more parameters and options for more complex aggregation operations. For detailed aggregation query syntax, refer to the official Elasticsearch documentation.