I'm not sure I'd consider that a DSL. It's unwieldy to write a full JSON object for every one-off query I want to do.

Using one of their examples, this:

    {
      "query": {
        "filtered": {
          "query": {
            "bool": {
              "must": [{"match": {"title": "python"}}],
              "must_not": [{"match": {"description": "beta"}}]
            }
          },
          "filter": {"term": {"category": "search"}}
        }
      },
      "aggs" : {
        "per_tag": {
          "terms": {"field": "tags"},
          "aggs": {
            "max_lines": {"max": {"field": "lines"}}
          }
        }
      }
    }

would be the following Splunk query:

    title=python description!=beta | stats max(lines) by tags

It would be nice if there was some kind of query compiler that could generate ES JSON from an expressive query language.