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- Extracts the JavaScript code contained within the $SCRIPT() block
Wraps the script with the following generic script block:
Code Block function getValue() { ... }
- Passes the function to the ScriptEngine using the ScriptEngine.eval() method
- Calls the getValue() method using the .invokeFunction() method.
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| Code Block |
|---|
var description = _doc.metadata.description[0]; |
Setting Field Values Example
In the following example, doc.metadata.json is used in javascript, in order to set some metadata values for the ingested Twitter data.
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| Code Block |
|---|
}, {
"assoc_type": "Event",
"entity1_index": "$SCRIPT( return _doc.metadata.json[0].actor.preferredUsername + '/twitterhandle';)",
"entity2_index": "$SCRIPT( return _iterator.text + '/hashtag'; )",
"iterateOver": "json.twitter_entities.hashtags",
"verb": "tweets_about",
"verb_category": "tweets_about"
},
{ |
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About Arrays
The code block below demonstrates how a field within a document's metadata might hold items in a typical JSON array object.
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