Right - you showed us you Studio instance. Your HANA instance is m2.2xlarge which is 34GB. That's not your problem then.
Double click on your system and see how much RAM is used and available - let's just double check that first.
Then let's dig into the index server log. Click Diagnosis Files, sort by modified date. There will be a file like indexserver_alert_saphana1.trc. Run an activation and see if something is logged in that file. Paste it here.
John
