When you enable the search integration service for a bucket, a JSON document is generated and sent to the destination endpoint each time object metadata or tags are added, updated, or deleted.
{ "bucket": "test", "key": "SGWS/Tagging.txt", "versionId": "", "accountId": "86928401983529626822", "size": 38, "md5": "3d6c7634a85436eee06d43415012855", "region":"us-east-1" "metadata": { "age": "25" }, "tags": { "color": "yellow" } }