Issue Summary

The current POST /rest/api/3/bulk/issues/fields endpoint only supports applying the same field value across all issues in the batch. There is no way to provide different values per issue within a single API call.

For example, if a user wants to update the summary of 10 issues to 10 different values, the current bulk edit API cannot accommodate this. The only available workaround is to make individual PUT /rest/api/3/issue/{issueIdOrKey} calls in a loop or in parallel, which defeats the purpose of a bulk API for automation-heavy workflows.

This is a regression compared to Jira Data Center / Server, where it was possible to submit multiple issues with different field values in a single bulk operation.

Extend POST /rest/api/3/bulk/issues/fields (or introduce a new endpoint) to support per-issue field values in a single request.

This reduces the number of API calls dramatically, especially for tools and apps managing hundreds or thousands of issues and keeps us inside the rate limits.