After changing port number in Elasticsearch.yml file its get Failed to start Elasticsearch

Elastic Stack Elasticsearch
16

but still i'm getting error after changing port number

failed to load elasticsearch nodes : org.elasticsearch.client.transport.NoNodeAvailableException: None of the configured nodes are available: [{#transport#-1}{w6EBzOANTCOj7GCaIM6xIw}{localhost}{127.0.0.1:9300}]

and do u have any idea on below issue

Caused by: org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint "spring_session_attributes_pk"