Scripting Elasticsearch 2.1| No such property: doc - elasticsearch

Question

I am facing an issue while trying to execute a script within an ES JSON request
The request:
POST _search
{
"query": {
"bool": {
"must": [
{
"match_all": {}
}
]
}
},
"aggs": {
"bucket_histogram": {
"histogram": {
"field": "dayTime",
"interval": 10
},
"aggs": {
"get_average": {
"avg": {
"field": "value"
}
},
"check-threshold": {
"bucket_script": {
"buckets_path": {
"averageValue": "get_average"
},
"script": "averageValue - doc[\"thresholdValue\"].value"
}
}
}
}
}
}
But I get this error instead of returning values
{
"error": {
"root_cause": [],
"type": "reduce_search_phase_exception",
"reason": "[reduce] ",
"phase": "fetch",
"grouped": true,
"failed_shards": [],
"caused_by": {
"type": "groovy_script_execution_exception",
"reason": "failed to run inline script [averageValue - doc[\"thresholdValue\"].value] using lang [groovy]",
"caused_by": {
"type": "missing_property_exception",
"reason": "No such property: doc for class: 7dcca7d142ac809a7192625d43d95bde9883c434"
}
}
},
"status": 503
}
Yet if I remove doc[\"thresholdValue\"] and enter a number everything works fine.

Answer 1

You are using a bucket_script, which is a part of the pipeline aggregations released with Elasticsearch 2.0. Pipeline aggregations work against other aggregations and not documents, which is why the doc context is not supplied to the aggregation.
If you want to process aggregations against specific documents, then perhaps you want the scripted metric aggregation instead.