: I am confused with the ordering rule about SpanNearQuery. For example, I
: indicate the slot in SpanNearQuery is 10. And the results are all the
: qualified documents. Is it true that any document with shorter distance
...
: it till uses tf-idf algorithm to rank the docs. Or there is some complex
: algorithm blending the distance and tf-idf algorithm.
Its blended ... think of each occurance of a specified span as a
"psuedo-term" but instead of each occurance incrementing the
"psuedo-term-frequency" by "1" it increments it by a floating point number
based on how sloppy the match was (an exact match is usually "1", a sloppy
match is usually something smaller)...
https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html#sloppyFreq%28int%29
As Jack mentioned: look at the explain results for the details for any
specific query & doc
-Hoss
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