title: Jira -- How to get issue changelog via REST API - but ALL, not single issue
body: <p>I've seen this question many times, but no sufficient answer.</p>
  
  <p>We're trying to dump all JIRA data into our data warehouse/ BI system. Or at least, the interesting parts.</p>
  
  <p>One thing you can do is track status times, cycle time, lead time directly with field durations. This is very easy via JIRA's direct SQL database. The tables changeItem and changeGroup.</p>
  
  <p>Of course the REST JSON API has less performance impact on the database.</p>
  
  <p>However ... there appears to be no equivalent in the rest API of fetching ALL issue change history. Yes, you can fetch the changelog of one issue directly via an API call. If you have 100k issues, are you expected to make 100k API calls, iterating through issue IDs? Sounds like madness.</p>
  
  <p>Is it somehow possible to expand changelogs through the search API, which amasses all issue data? I haven't seen it. Is what I'm seeking here possible? Or will we have to stick to the SQL route?</p>