Launch Aspire (if it's not already running).
See:
Now that the content source is set up, the crawl can be initiated.
The status will show RUNNING while the crawl is going, and CRAWLED when it is finished.
If there are errors, you will get a clickable "Error" flag that will take you to a detailed error message page.
If you only want to process content updates from the Amazon S3 (documents which are added, modified, or removed), then click Incremental instead of Full.
The Amazon S3 connector will automatically identify only changes which have occurred since the last crawl.
If this is the first time that the connector has crawled, the action of the "Incremental" button depends on the exact method of change discovery. It may perform the same action as a "Full" crawl crawling everything, or it may not crawl anything. Thereafter, the Incremental button will only crawl updates.