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Is there a way to dynamically add fields using scripts? I am running a script that checks whether a field exists. If not then creates it.
I'm trying out:
script: 'if (ctx._source.attending == null) { ctx._source.attending = { events: newField } } else if (ctx._source.attending.events == null) { ctx._source.attending.events = newField } else { ctx._source.attending.events += newField }'
Except unless I have a field in my _source explicitly named attending in my case, I get:
[Error: ElasticsearchIllegalArgumentException[failed to execute script];
nested: PropertyAccessException[
[Error: could not access: attending; in class: java.util.LinkedHashMap]
477
Create scripted fieldsedit Select the data view you want to add a scripted field to. Select the Scripted fields tab, then click Add scripted field. Enter a Name for the scripted field, then enter the Script you want to use to compute a value on the fly from your index data. Click Create field.
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": { ... } }
Painless is a simple, secure scripting language designed specifically for use with Elasticsearch. It is the default scripting language for Elasticsearch and can safely be used for inline and stored scripts.
To check whether a field exists use the ctx._source.containsKey function, e.g.:
curl -XPOST "http://localhost:9200/myindex/message/1/_update" -d'
{
"script": "if (!ctx._source.containsKey(\"attending\")) { ctx._source.attending = newField }",
"params" : {"newField" : "blue" },
"myfield": "data"
}'
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