If the object storage service you are referring to is AWS S3, then the Splunk App for AWS v4 (https://splunkbase.splunk.com/app/1274/) has an easy to use data input for S3 buckets. Here are the instructions on how to setup a S3 data input for the Splunk App for AWS.
http://docs.splunk.com/Documentation/AWS/latest/Installation/S3
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