* Bulk helper onSuccess callback
For https://github.com/elastic/elasticsearch-js/issues/2090
Includes refactor of the tryBulk result processing code, to make
iterating over bulk response data easier to understand.
* Add onSuccess tests for each datasource type
* Cleanup, additional comments
* Add documentation for onSuccess callback
* Update changelog
* Drop link to 8.14 release notes.
Page not yet published, breaking docs build.
* Added client helpers
* Updated test
* The search helper should return only the documents
* Added code comments
* Fixed bug
* Updated test
* Removed bulkSize and added flushBytes
* Updated test
* Added concurrency
* Updated test
* Added support for 429 handling in the scroll search helper
* Updated test
* Updated stats count
* Updated test
* Fix test
* Use client maxRetries as default
* Updated type definitions
* Refactored bulk helper to be more consistent with the client api
* Updated test
* Improved error handling, added refreshOnCompletion option and forward additinal options to the bulk api
* Updated type definitions
* Updated test
* Fixed test on Node v8
* Updated test
* Added TODO
* Updated docs
* Added Node v8 note
* Updated scripts
* Removed useless files
* Added helpers to integration test
* Fix cli argument position
* Moar fixes
* Test run elasticsearch in github actions
* Use master action version
* Add vm.max_map_count step
* Test new action setup
* Added Configure sysctl limits step
* Updated action to latest version
* Don't run helpers integration test in jenkins
* Run helpers integratino test also with Node v10
* Updated docs
* Updated docs
* Updated helpers type definitions
* Added test for helpers type definitions
* Added license header
