I have a collection of documents which all contain an array of nested objects with important data. I want do to an aggregation on these which returns me the first document, last document, and all of the nested objects in that group. I can achieve everything in that list except for the nested objects.
Mapping:
"instances": {
"properties": {
"aggField": {
"type": "string",
"index": "not_analyzed"
},
"id": {
"type": "integer"
},
"nestedObjs": {
"type": "nested",
"properties": {
"key": {
"type": "string",
"index": "not_analyzed"
},
"value": {
"type": "integer"
}
}
},
"timestamp": {
"type": "date",
"format": "dateOptionalTime"
}
}
}
Query:
{
"size" : 0,
"aggs" : {
"agg-buckets" : {
"terms" : {
"field" : "aggField",
"size" : 10
},
"aggs": {
"last-report": {
"top_hits": {
"sort": [
{
"timestamp": {
"order": "desc"
}
}
],
"size": 1
}
},
"first-report": {
"top_hits": {
"sort": [
{
"timestamp": {
"order": "asc"
}
}
],
"size": 1
}
},
"nested-objs": {
"nested": {
"path": "nestedObjs",
"inner_hits": {}
}
}
}
}
}
But this fails with:
"error": {
"root_cause": [
{
"type": "search_parse_exception",
"reason": "Unexpected token START_OBJECT in [nested-objs].",
"line": 12,
"col": 45
}
],
If I remove the "inner_hits" field it works ok. But it just gives me the document count and not the documents themselves.
What am I doing wrong?
I have tried this on ES 1.7.1 and 2.0.0
