search_api callback causes undefined property errors in SearchApiAttachmentsAlterSettings

I was able to address this by changing the 3 instances of entity_type to item_type in "includes/callback_attachments_settings.inc".

This removed the notices and seemed to make sure that the correct path was taken in code. But, my content still wasn't indexing.

After troubleshooting, I determined that the extractTika call was failing. Instead of raising an error, though, the result would just be an empty string returned to the calling function.

In my case, it failed because the file_create_url call created a URI that was not accessible by the java executable. I found two different solutions for this.

1) By replacing file_create_url with drupal_realpath, there was no http call...it just pulled the file straight from the filesystem.
2) By specifying the proxy information in /etc/java-6-openjdk/net.properties, the call completed successfully.

I'm not sure if option (1) would break anything...shouldn't all attachments be on the filesystem? Or are there cases where the file is simply a remote URI that would need to be fetched?

Also, maybe STDERR should be captured to a temp file, and if it is not empty, the error should be raised, or at least sent to watchdog().