Calculate the average age of the results returned by a search in Elasticsearch

Question

What is the syntax for calculating the average age of the results returned by a search?

Accepted Answer

```
POST /people/_search?size=0
{
  "aggs": {
    "avg_age": { "avg": { "field": "age" } }
  }
}

```

Answer

```
POST /people/_search?size=0
{
  "agg": {
    "avg": { "field": "age" }
  }
}

```

Answer

```

POST /people/_search?size=0
{
  "agg": {
    "avg_age": { "avg": { "field": "age" } }
  }
}

```

Answer

```
POST /people/_search?size=0
{
  "aggs": {
    "avg": { "field": "age" }
  }
}
```

Question from the Elasticsearch test