I am trying to use ScriptRunner's BulkImportCustomFieldValues REST API endpoint, however, I don't understand what the FIELD_FCS (Field Configuration Scheme) has to do with it and where to get the correct ID for it.
Could someone explain what I have to place in that parameter and where to find it?
I'm also confused on the whole FCS component of JIRA. I saw FCS being used on project level in discussions and in the settings I looked, but why would you specify the FCS if you're importing into one field, not into an entire project? How would it know which field to populate? Any help, or useful documentation, would be appreciated.