I had a task to create a nested AggregationBuilder with two levels with Elasticsearch 5.6. The query was similar to:
GET _data/_search
{
"aggs":{
"nestedAttributes":{
"nested": {
"path": "ATTRIBUTES": {
},
"aggs":{
"filteredAttributes":{
"term": {
"ATTRIBUTES.TYPE": "AUTHORIZATIONS"
},
"aggs":{
"descriptions":{
"terms": {
"field": "ATTRIBUTES.DESC",
"size": 2
}
etc... closing braces
The Java code was something like this:
setAggregations(SearchRequestBuilder builder) {
builder.AddAggregation( etc...
.subAggregation(AggregationsBuilders.nested("nestedPath", "ATTRIBUTES")
.subAggregation(AggregationsBuilders.filter("filterName", QueryBuilders.boolQuery().must(QueryBuilders.termQuery("ATTRIBUTES.TYPE", "AUTHORIZATIONS")))
.subAggregations("AggregationsBuilders.terms("attributesTerms").field("ATTRIBUTES.DESC")
.size(1000000000)));
This code worked, but it was not testable, so I had to break it out into a method. The problem is I keep getting class cast errors trying to call it from within my code and I'm not sure what the correct types are?
Basically it's
.subAggregations(getAttributes())
.subAggregations( etc...
My method:
private AggregationBuilder getAttributes() {
//same AggregationBuilders code as above but with a return statement etc...
return AggregationBuilder;
}
I've tried to return a Builder, AggregationBuilder, but while it compiles I get a runtime class cast exception error each time. What type of object do I need to return to get this to run?