Update batch-ingestion.md (#4963)
Update batch-ingestion.md (#4963)

I've had problems ingesting several S3 files with Druid. After checking I saw this: https://groups.google.com/forum/#!msg/druid-user/4L62vjor4NM/p8Z_R3lEAQAJ and realised that the docs hasn't been updated. This issue might have been solved with new Druid versions, but for those who are still using older ones (0.9.2), it's nice having this change made :)
Fokko/druid,leventov/druid,monetate/druid,deltaprojects/druid,andy256/druid,pjain1/druid,leventov/druid,jon-wei/druid,dkhwangbo/druid,b-slim/druid,implydata/druid,leventov/druid,monetate/druid,winval/druid,metamx/druid,michaelschiff/druid,michaelschiff/druid,knoguchi/druid,b-slim/druid,himanshug/druid,winval/druid,b-slim/druid,jon-wei/druid,druid-io/druid,mghosh4/druid,nishantmonu51/druid,jon-wei/druid,nishantmonu51/druid,monetate/druid,dkhwangbo/druid,metamx/druid,druid-io/druid,knoguchi/druid,gianm/druid,michaelschiff/druid,jon-wei/druid,winval/druid,mghosh4/druid,andy256/druid,liquidm/druid,metamx/druid,liquidm/druid,gianm/druid,pjain1/druid,liquidm/druid,knoguchi/druid,druid-io/druid,himanshug/druid,gianm/druid,implydata/druid,pjain1/druid,michaelschiff/druid,implydata/druid,nishantmonu51/druid,gianm/druid,nishantmonu51/druid,gianm/druid,mghosh4/druid,liquidm/druid,Fokko/druid,winval/druid,deltaprojects/druid,michaelschiff/druid,metamx/druid,michaelschiff/druid,b-slim/druid,gianm/druid,taochaoqiang/druid,jon-wei/druid,taochaoqiang/druid,pjain1/druid,leventov/druid,deltaprojects/druid,andy256/druid,deltaprojects/druid,nishantmonu51/druid,b-slim/druid,knoguchi/druid,nishantmonu51/druid,monetate/druid,mghosh4/druid,implydata/druid,Fokko/druid,mghosh4/druid,mghosh4/druid,knoguchi/druid,gianm/druid,taochaoqiang/druid,jon-wei/druid,deltaprojects/druid,taochaoqiang/druid,dkhwangbo/druid,deltaprojects/druid,monetate/druid,monetate/druid,Fokko/druid,deltaprojects/druid,implydata/druid,himanshug/druid,liquidm/druid,dkhwangbo/druid,leventov/druid,metamx/druid,Fokko/druid,himanshug/druid,nishantmonu51/druid,andy256/druid,Fokko/druid,Fokko/druid,taochaoqiang/druid,druid-io/druid,implydata/druid,jon-wei/druid,himanshug/druid,dkhwangbo/druid,pjain1/druid,liquidm/druid,winval/druid,andy256/druid,pjain1/druid,druid-io/druid,pjain1/druid,michaelschiff/druid,monetate/druid,mghosh4/druid