You can select any project type but since you are integrating with Bitbucket, go with the Software Developement project. The DVCS connector will sync commits from Bitbucket to JIRA issues (commit tab) in your new project.
More details available here:
The Jira Marketing team is putting together an ebook on migrating to Data Center. We're looking for pro tips on how you staffed your project team and organized your Proof of Concept. Share yo...
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