(No obvious correlation to a particular logstash error, so no stack trace.)
```lines=12
HTTPError: 500: server_error
at apiError (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/restbase/sys/action.js:127:12)
at checkQueryResponse (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/restbase/sys/action.js:136:15)
at buildQueryResponse (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/restbase/sys/action.js:142:5)
at tryCatcher (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/util.js:16:23)
at Promise._settlePromiseFromHandler (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/promise.js:547:31)
at Promise._settlePromise (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/promise.js:604:18)
at Promise._settlePromise0 (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/promise.js:649:10)
at Promise._settlePromises (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/promise.js:729:18)
at _drainQueueStep (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/async.js:93:12)
at _drainQueue (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/async.js:86:9)
at Async._drainQueues (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/async.js:102:5)
at Immediate.Async.drainQueues (/srv/deployment/restbase/deploy-cache/revs/bfdd342afd64d297821d508d9cf794806727f158/node_modules/bluebird/js/release/async.js:15:14)
at runCallback (timers.js:672:20)
at tryOnImmediate (timers.js:645:5)
at processImmediate [as _immediateCallback] (timers.js:617:5)```