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Explain API
editExplain API
editThe explain api computes a score explanation for a query and a specific document. This can give useful feedback whether a document matches or didn’t match a specific query.
The index
and type
parameters expect a single index and a single
type respectively.
Usage
editFull query example:
curl -XGET 'localhost:9200/twitter/tweet/1/_explain' -d '{ "query" : { "term" : { "message" : "search" } } }'
This will yield the following result:
{ "matches" : true, "explanation" : { "value" : 0.15342641, "description" : "fieldWeight(message:search in 0), product of:", "details" : [ { "value" : 1.0, "description" : "tf(termFreq(message:search)=1)" }, { "value" : 0.30685282, "description" : "idf(docFreq=1, maxDocs=1)" }, { "value" : 0.5, "description" : "fieldNorm(field=message, doc=0)" } ] } }
There is also a simpler way of specifying the query via the q
parameter. The specified q
parameter value is then parsed as if the
query_string
query was used. Example usage of the q
parameter in the
explain api:
curl -XGET 'localhost:9200/twitter/tweet/1/_explain?q=message:search'
This will yield the same result as the previous request.
All parameters:
edit
|
Set to |
|
Allows to control which stored fields to return as part of the document explained. |
|
Controls the routing in the case the routing was used during indexing. |
|
Same effect as setting the routing parameter. |
|
Controls on which shard the explain is executed. |
|
Allows the data of the request to be put in the query string of the url. |
|
The query string (maps to the query_string query). |
|
The default field to use when no field prefix is defined within the query. Defaults to _all field. |
|
The analyzer name to be used when analyzing the query string. Defaults to the analyzer of the _all field. |
|
Should wildcard and prefix queries be analyzed or not. Defaults to false. |
|
Should terms be automatically lowercased or not. Defaults to true. |
|
If set to true will cause format based failures (like providing text to a numeric field) to be ignored. Defaults to false. |
|
The default operator to be used, can be AND or OR. Defaults to OR. |