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curl -XPOST 'localhost:9200/customer/external/1/_update?pretty' -d '
{
"script" : "ctx._source.age += 5"
}'
This an example on official site. I am confused with ctx, what does it mean? Context?
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the ctx. payload field contains the response of the search request you executed in your input. If you execute a HTTP request against any service, this payload will change according to the response.
ctx['op'] Use the default of index to update a document. Set to none to specify no operation or delete to delete the current document from the index. ctx['_source'] Modify the values in the Map/List structure to add, modify, or delete the fields of a document.
DescriptioneditEnables you to script document updates. The script can update, delete, or skip modifying the document. The update API also supports passing a partial document, which is merged into the existing document. To fully replace an existing document, use the index API.
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.
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.
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