For one of my ElasticSearch queries, I'd like to define define a function score and sort by it. The function score takes the computed score and adds a boost value to it. Each document has its boost value stored in a numeric field.
Like this:
{
"from": 0,
"size": 10,
"query": {
"function_score": {
"functions": [
{
"script_score": {
"script": "_score + doc['boostFactor'].value"
}
}
],
"query": {
"filtered": {
"query": {
"query_string": {
"query": "search for this!"
}
}
}
},
"boost_mode": "replace"
}
}
}
So far so good, this works fine. Now here's the problem: going forward, each document will have an array of boost values:
"boostFactor": [ 0, 0.5, 1, 3 ]
When firing up the query, I'd like the script score to pick a particular element of the array, based on a predefined index. So let's say index=2, then the script score would potentially look like this:
"script_score": {
"script": "_score + doc['boostFactor'][2].value"
}
Unfortunately, ElasticSearch doesn't accept this:
...Query Failed [Failed to execute main query]];
nested: CompileException[[Error: unexpected token in constructor]...
Any ideas?
