You could use a custom Similarity implementation for this query, where tf() is the identity function, idf() returns 1.0, etc., so that the final score is the occurance count. You'll need to divide by Similarity.decodeNorm(indexReader.norms("field")[doc]) at the end to get rid of the lengthNorm() and field boost (if any).
Much simpler would be to build a SpanNearQuery, call getSpans(), then loop, counting how many times Spans.next() returns true.
Doug
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