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I have no Java experience and I have an issue with elasticsearch painless script language. (the name painless it's not well chosen).
For the following code I get the error:
{"lang": "painless", "inline": "float price = doc['newPrice'] > 0.0 ? doc['price'] / doc['newPrice'] : 0; _score * params.constant * price", "params": {"constant": 1.2}}}} Cannot apply [>] operation to types [org.elasticsearch.index.fielddata.ScriptDocValues.Doubles] and [java.lang.Double].
I tied to cast it as float with (float) doc['newPrice'] > 0 with the same error.
Then I changed to "Double price = ((Double)doc['discountPrice'] > 0.0) ? doc['price'] / doc['discountPrice'] : 0; _score * params.constant * price",
And received:
'Cannot cast from [Double] to [double].'
Can somebody help me, tried lots of variations with similar kind of errors. Damn painless language...
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Painless is a performant, secure scripting language designed specifically for Elasticsearch. You can use Painless to safely write inline and stored scripts anywhere scripts are supported in Elasticsearch.
Debug. For now the best way to debug embedded scripts is by throwing exceptions at choice places. While you can throw your own exceptions ( throw new Exception('whatever') ), Painless's sandbox prevents you from accessing useful information like the type of an object.
ctx is a special variable that allows you to access the source of the object that you want to update. The ctx. _source is a writable version of the source . NOTE: You can modify this document in the script and the modified source will be persisted as the new version of the document.
Wherever scripting is supported in the Elasticsearch APIs, the syntax follows the same pattern; you specify the language of your script, provide the script logic (or source), and add parameters that are passed into the script: "script": { "lang": "...", "source" | "id": "...", "params": { ... } }
You're simply missing the .value to access the field value.
Your script needs to be like this instead:
double price = doc['newPrice'].value > 0.0 ? doc['price'].value / doc['newPrice'].value : 0; _score * params.constant * price 
doc['newPrice'] is different from
doc['newPrice'].value You should use the later
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