[#540] Fixed incorrect index settings in `BulkIntegrationTest`
[#540] Fixed incorrect index settings in `BulkIntegrationTest`

The "extract the routing value from documents" test in `BulkIntegrationTest`
was failing because the `bulk-test` index was created with only 1 shard,
so the filtering with the routing parameter couldn't work.

Fixes #537, closes #540.

doximity/tire,iamrahulroy/retire,fabn/retire,karmi/retire,Telmate/tire,alphagov/tire,mavenlink/retire,HenleyChiu/tire,1776/tire,dbose/retire,brijeshgpt7/retire,elbuo8/retire,ChapterMedia/tire,rubydubee/retire,tklee/tire_shiphawk,zaharpecherin/retire