**During performance testing done in scope of
PERF-144 vertx Http client have been identified.
- The memory leak has been addressed
- Performance tests confirm the fix
- Growing CPU/RAM usage is addressed and does not occur during multiple harvests
- Unit tests are written
- API tests are updated
- Tests run on team's oai-pmh test environment with 5M records confirm improved performance
- Performance testing report: https://wiki.folio.org/pages/viewpage.action?pageId=65114555
- The leak was observed after multiple full harvests were conducted.