Metric aggregation fails in composite aggregation

[freedrikp]

Hi!

I'm using Elasticsearch to store test results of a software. I'm running Elasticsearch on Docker CE with the following configuration:

Docker version 17.12.0-ce, build c97c6d6
Ubuntu 14.04.5 LTS 14.04 trusty
docker.elastic.co/elasticsearch/elasticsearch-oss:6.2.1
docker.elastic.co/kibana/kibana-oss:6.2.1

The documents look like the following:

    {  
       "product":{  
          "software":{  
             "revision":"251ebc1ed721622f49c5485068f8b39c45005a20",
             "date":"2018-02-09T17:40:34+00:00"
          },
          "os":{  
             "name":"Ubuntu",
             "version":"14.04"
          }
       },
       "results":{  
          "summary":{  
             "Pass":2,
             "Fail":3
          }
       }
    }

I want to compute the average Pass and Fail numbers for all combinations of os.name and os.version for their newest software version, so I use the following Composite query:

    GET _search
    {
      "size": 0,
        "query": {
          "match_all": {}
        },
        "aggs": {
          "products": {
            "composite": {
              "sources": [
                {
                  "osName": {
                    "terms": {
                      "field": "product.os.name.keyword"
                    }
                  }
                },
                {
                  "osVer": {
                    "terms": {
                      "field": "product.os.version.keyword"
                    }
                  }
                }
              ]
            },
            "aggs": {
              "revision": {
                "terms": {
                  "field": "product.software.revision.keyword",
                  "order": {
                    "SWDate": "desc"
                  },
                  "size": 1
                },
                "aggs": {
                  "SWDate": {
                    "max": {
                      "field": "product.software.date"
                    }
                  },
                   "Pass": {
                    "avg": {
                      "field": "results.summary.Pass",
                      "missing": 0
                    }
                  }
                }
              }
            }
          }
        }
      }

However, this fails with:

    "_shards": {
        "total": 6,
        "successful": 1,
        "skipped": 0,
        "failed": 5,
        "failures": [
          {
            "shard": 0,
            "index": "test_results",
            "node": "<nodeId>",
            "reason": {
              "type": "illegal_state_exception",
              "reason": "Cannot replay yet, collection is not finished: postCollect() has not been called"
            }
          }
        ]
      }

If I remove the Pass average aggregation it does not fail but id does fail with other metric aggregations. Any ideas what I might do wrong? Thanks!

[colings86]

@elastic/es-search-aggs