I am using Elasticsearch 1.4.4.
I am defining a parent-child index with three levels (grandparents)
following the instructions in the document:
https://www.elastic.co/guide/en/elasticsearch/guide/current/grandparents.html
My structure is
Continent -> Country -> Region
MAPPING
I create an index with the following mapping:
curl -XPOST 'localhost:9200/geo' -d'
{
"mappings": {
"continent": {},
"country": {
"_parent": {
"type": "continent"
}
},
"region": {
"_parent": {
"type": "country"
}
}
}
}'
INDEXING
I index three entities:
curl -XPOST 'localhost:9200/geo/continent/europe' -d'
{
"name":"Europe"
}'
curl -XPOST 'localhost:9200/geo/country/italy?parent=europe' -d'
{
"name":"Italy"
}'
curl -XPOST
'localhost:9200/geo/region/lombardy?parent=italy&routing=europe' -d'
{
"name":"Lombardia"
}'
QUERY THAT WORKS
If I query and aggregate according to the document everything works fine:
curl -XGET 'localhost:9200/geo/continent/_search?pretty=true' -d '
{
"query": {
"has_child": {
"type": "country",
"query": {
"has_child": {
"type": "region",
"query": {
"match": {
"name": "Lombardia"
}
}
}
}
}
},
"aggs": {
"country": {
"terms": {
"field": "name"
},
"aggs": {
"countries": {
"children": {
"type": "country"
},
"aggs": {
"country_names" : {
"terms" : {
"field" : "country.name"
}
}
}
}
}
}
}
}'
QUERY THAT DOES NOT WORK
However, if I try with multi-level aggregations like in:
curl -XGET 'localhost:9200/geo/continent/_search?pretty=true' -d '
{
"query": {
"has_child": {
"type": "country",
"query": {
"has_child": {
"type": "region",
"query": {
"match": {
"name": "Lombardia"
}
}
}
}
}
},
"aggs": {
"continent_names": {
"terms": {
"field": "name"
},
"aggs": {
"countries": {
"children": {
"type": "country"
},
"aggs": {
"regions": {
"children": {
"type": "region"
},
"aggs": {
"region_names" : {
"terms" : {
"field" : "region.name"
}
}
}
}
}
}
}
}
}
}'
I get back the following
{
"error" : "SearchPhaseExecutionException[Failed to execute phase [query],
all shards failed; shardFailures {[b5CbW5byQdSSW-rIwta0rA][geo][0]:
QueryPhaseExecutionException[[geo][0]:
query[filtered(child_filter[country/continent](filtered(child_filterregion/country)->cache(_type:country)))->cache(_type:continent)],from[0],size[10]:
Query Failed [Failed to execute main query]]; nested: NullPointerException;
}{[b5CbW5byQdSSW-rIwta0rA][geo][1]: QueryPhaseExecutionException[[geo][1]:
query[filtered(child_filter[country/continent](filtered(child_filterregion/country)->cache(_type:country)))->cache(_type:continent)],from[0],size[10]:
Query Failed [Failed to execute main query]]; nested: NullPointerException;
}{[b5CbW5byQdSSW-rIwta0rA][geo][2]: QueryPhaseExecutionException[[geo][2]:
query[filtered(child_filter[country/continent](filtered(child_filterregion/country)->cache(_type:country)))->cache(_type:continent)],from[0],size[10]:
Query Failed [Failed to execute main query]]; nested: NullPointerException;
}{[b5CbW5byQdSSW-rIwta0rA][geo][3]: QueryPhaseExecutionException[[geo][3]:
query[filtered(child_filter[country/continent](filtered(child_filterregion/country)->cache(_type:country)))->cache(_type:continent)],from[0],size[10]:
Query Failed [Failed to execute main query]]; nested: NullPointerException;
}{[b5CbW5byQdSSW-rIwta0rA][geo][4]: QueryPhaseExecutionException[[geo][4]:
query[filtered(child_filter[country/continent](filtered(child_filterregion/country)->cache(_type:country)))->cache(_type:continent)],from[0],size[10]:
Query Failed [Failed to execute main query]]; nested: NullPointerException;
}]",
"status" : 500
}
The 'grandparents' document says: "Querying and aggregating across
generations works, as long as you step through each generation."
How do I get the last query and aggregation to work across all three levels
of the index?
What am I missing?
Thank you,
Paolo
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