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Has Child Query
editHas Child Query
editThe has_child
filter accepts a query and the child type to run against, and
results in parent documents that have child docs matching the query. Here is
an example:
{ "has_child" : { "type" : "blog_tag", "query" : { "term" : { "tag" : "something" } } } }
Scoring capabilities
editThe has_child
also has scoring support. The
supported score modes are min
, max
, sum
, avg
or none
. The default is
none
and yields the same behaviour as in previous versions. If the
score mode is set to another value than none
, the scores of all the
matching child documents are aggregated into the associated parent
documents. The score type can be specified with the score_mode
field
inside the has_child
query:
{ "has_child" : { "type" : "blog_tag", "score_mode" : "sum", "query" : { "term" : { "tag" : "something" } } } }
Min/Max Children
editThe has_child
query allows you to specify that a minimum and/or maximum
number of children are required to match for the parent doc to be considered
a match:
{ "has_child" : { "type" : "blog_tag", "score_mode" : "sum", "min_children": 2, "max_children": 10, "query" : { "term" : { "tag" : "something" } } } }
The min_children
and max_children
parameters can be combined with
the score_mode
parameter.