Rollup search endpoint fails on wildcard index pattern

[jen-huang]

I have defined a rollup job, ran it, and the rollup index is called jen-rollup.

Sending a search request request with the index name (GET jen-rollup/_rollup_search) directly returns correct results.

But sending the request with an asterisk at the end of the index name (GET jen-rollup*/_rollup_search) returns no results.

Per documentation, index can be Index, indices or index-pattern to execute a rollup search against. This can include both rollup and non-rollup indices. Docs also state Only one rollup index may be specified. If more than one are supplied an exception will be thrown.

Given these two criteria, I would expect that since jen-rollup* only matches one rollup index, querying it should give the same results as querying jen-rollup.

Example query that returns no results with *, but correct results without:

GET jen-rollup*/_rollup_search
{
  "aggs": {
    "2": {
      "date_histogram": {
        "field": "@timestamp",
        "interval": "60m",
        "time_zone": "UTC",
        "min_doc_count": 1
      }
    }
  },
  "size": 0,
  "_source": {
    "excludes": []
  },
  "stored_fields": [
    "*"
  ],
  "script_fields": {},
  "docvalue_fields": [
    {
      "field": "@timestamp",
      "format": "date_time"
    }
  ],
  "query": {
    "bool": {
      "must": [
        {
          "range": {
            "@timestamp": {
              "gte": 1539808778039,
              "lte": 1540413578039,
              "format": "epoch_millis"
            }
          }
        }
      ],
      "filter": [
        {
          "match_all": {}
        }
      ],
      "should": [],
      "must_not": []
    }
  }
}

[jen-huang]

cc @cjcenizal @spalger @polyfractal

[elasticmachine]

Pinging @elastic/es-search-aggs