Camel AWS-DDB scan/query

Hello,
I'm using Camel AWS-DDB for the first time and have some issues getting data
from DynamoDB.

Could you, please, help me with this? I'm able to add some item, update by
primary Hash/Range key (by defining Key object) but is it possible to do it
by database indexes?
I created some indexes on database with Hash/Range keys defined and could
not find any example of using them in camel. Is it possible to Query/Scan db
by indexes? How can I get list of items by value of some other field? I
tried CamelAwsDdbScanFilter but without success.
Could you give me some examples of querying/scanning dynamoDB?

Thanks in advance