I have the following sample mapipng:
{
"book" : {
"properties" : {
"author" : { "type" : "string" },
"title" : { "type" : "string" },
"reviews" : {
"properties" : {
"url" : { "type" : "string" },
"score" : { "type" : "integer" }
}
},
"chapters" : {
"include_in_root" : 1,
"type" : "nested",
"properties" : {
"name" : { "type" : "string" }
}
}
}
}
}
I would like to get a facet on number of reviews - i.e. length of the
"reviews" array.
For instance, verbally spoken results I need are: "100 documents with 10
reviews, 20 documents with 5 reviews, ..."
I'm trying the following statistical facet:
{
"query" : {
"match_all" : {}
},
"facets" : {
"stat1" : {
"statistical" : {"script" :
"doc['reviews.score'].values.size()"}
}
}
}
but it keeps failing with:
{
"error" : "SearchPhaseExecutionException[Failed to execute phase
[query_fetch], total failure; shardFailures
{[mDsNfjLhRIyPObaOcxQo2w][facettest][0]:
QueryPhaseExecutionException[[facettest][0]:
query[ConstantScore(NotDeleted(cache(org.elasticsearch.index.search.nested.NonNestedDocsFilter@a2a5984b)))],from[0],size[10]:
Query Failed [Failed to execute main query]]; nested:
PropertyAccessException[[Error: could not access: reviews; in class:
org.elasticsearch.search.lookup.DocLookup]
[Near : {... doc[reviews.score].values.size() ....}]
^
[Line: 1, Column: 5]]; }]",
"status" : 500
}
How can I achieve my goal?
Thank you in advance.
Here is my example data:
{
"author" : "Mark Twain",
"title" : "The Adventures of Tom Sawyer",
"reviews" : [
{
"url" : "amazon.com",
"score" : 10
},
{
"url" : "www.barnesandnoble.com",
"score" : 9
}
],
"chapters" : [
{ "name" : "Chapter 1" }, { "name" : "Chapter 2" }
]
}
{
"author" : "Jack London",
"title" : "The Call of the Wild",
"reviews" : [
{
"url" : "amazon.com",
"score" : 8
},
{
"url" : "www.barnesandnoble.com",
"score" : 9
},
{
"url" : "www.books.com",
"score" : 5
}
],
"chapters" : [
{ "name" : "Chapter 1" }, { "name" : "Chapter 2" }
]
}
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