[#724] Use modulo in Mongoid import strategy for breaking up collection
[#724] Use modulo in Mongoid import strategy for breaking up collection

In Mongoid import strategy, use the modulo division for better semantics
of breaking up the collection into batches.

Fixes: #724

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