I am getting the exactly same score like 0. 04809519 for different size documents for some queries and this happens quite frequently. Based on the score formula, it seems this should rarely happen. Or I misunderstand the formula?
Normalization factors (& document boosts) are represented in the index using a one-byte float format with a 3-bit mantissa, which means that differences of plus-or-minus 1/8 are rounded to a single value.
For example, a field with 256 tokens by default has a lengthNorm() of 16.0. With a three-bit mantissa, values 16.0 to 18.0 are rounded to the same value, which means that fields with between 256 and 324 tokens will have the same effective length normalization.
Doug
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