@charith-elastic, Thanks for the tips, I achieved to solve my problem 
!
It was a wrong path to the location of my truststore file.
I set the wrong following configuration in spark
--conf spark.kubernetes.driver.secrets.elasticsearch-truststore-secret=/etc/secrets/trutstore.jks
--conf spark.kubernetes.driver.secrets.elasticsearch-truststore-secret=/etc/secrets/trutstore.jks
Then, it created a folder named trutstore.jks not a file.
So I just changed for:
--conf spark.kubernetes.driver.secrets.elasticsearch-truststore-secret=/etc/secrets/trutstore
--conf spark.kubernetes.driver.secrets.elasticsearch-truststore-secret=/etc/secrets/trutstore
And the right location is /etc/secrets/trutstore/trutstore.jks
Yassir