The ScoreExplain field expression will create a dynamic field that will contain the explanation of how the score was derived for a document. NOTE: This field expression should be used for debugging purposes only as it is extremely costly to compute. Setting the QueryRequest to debug mode will be equivalent to automatically adding a ScoreExplain field expression to the request.
Example:
QueryRequest request = new QueryRequest("AND(title:java, content:xml)");
request.addField("*"); // make sure we get all stored fields.
request.addField( new ScoreExplain("score.explain") );
// ... (Perform Search)
REST Syntax:
SCOREEXPLAIN()
Example:
# Get score explain as text &fields=SCOREEXPLAIN() AS score.explain