The documentation for custom_filters_score does not provide an example of
how "script" can be used. However, it refers to function_score in later
versions of ES search, and the doc of function_score has the following
example:
"custom_filters_score": {
"filters": [
{
"boost_factor": "3",
"filter": {...}
},
{
"filter": {รข.},
"script": "_score * doc['my_numeric_field'].value / pow(param1,
param2)"
}
],
"params": {
"param1": 2,
"param2": 3.1
},
"query": {...},
"score_mode": "first"
}
becomes:
"function_score": {
"functions": [
{
"boost_factor": "3",
"filter": {...}
},
{
"filter": {...},
"script_score": {
"params": {
"param1": 2,
"param2": 3.1
},
"script": "_score * doc['my_numeric_field'].value / pow(param1,
param2)"
}
}
],
"query": {...},
"score_mode": "first"
}
The script in the example seems to imply that the script will solely
determine the score, but in practice the value evaluated by the script will
be multiplied with the query score. So the script in the example should
have been: "doc['my_numeric_field'].value / pow(param1, param2)"
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