Truncate part of an existing url field value to a new field using painless?

i have a requirement where i have to trim field based on url i have to trim until rules /someapi/api/v4/bdq/rules/16869

Take a look at ingest scripts:

For existing documents, you'll want to look at update by query

looking for something like this

def path = doc['internalUri.keyword'].contains('v*');
/which will retrieve all paths which contains word v3,v2,v1/
if (path != null) {
return path.Substring(1,23);
abstract only v3 from path
return "";

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