Aggregations on PyElasticSearch (pyes) - elasticsearch

Question

I wish to calculate value-count aggregations on some indexed product data, but I seem to be getting some parameters in the ValueCountAgg constructor wrong.
An example of such indexed data is as follows -:
{
"_index": "test-index",
"_type": "product_product",
"_id": "1",
"_score": 1,
"_source": {
"code": "SomeProductCode1",
"list_price": 10,
"description": null,
"displayed_on_eshop": "true",
"active": "true",
"tree_nodes": [],
"id": 1,
"category": {},
"name": "This is Product",
"price_lists": [
{
"price": 10,
"id": 1
},
{
"price": 10,
"id": 2
}
],
"attributes": {
"color": "blue",
"attrib": "something",
"size": "L"
},
"type": "goods"
}
}
I'm calculating aggregations as follows -:
for attribute in filterable_attributes:
count = ValueCountAgg(
name='count_'+attribute, field='attributes.'+attribute
)
query.agg.add(count)
where query is a ~pyes.query.Query object wrapped inside a ~pyes.query.Search object. filterable_attributes is a list of attribute names, such as color and size.
I have tried setting field=attribute as well, but it seems to make no difference. The resultset that I obtain on conducting the search has the following as its aggs attribute -:
{'count_size': {'value': 0}, 'count_color': {'value': 0}}
where size and color are indexed inside the attributes dictionary as shown above. These are evidently wrong results, and I think it is because I am not setting field properly.
Where am I going wrong?

Answer 1

I've found where I was going wrong.
According to Scoping Aggregations, the scope of an aggregation is by default associated with its query. My query was returning zero results, and I had to modify the search phrase for the same.
I got the required results after that, and aggregations are coming out right.
{'count_size': {'value': 3}, 'count_color': {'value': 3}}