lazy val conf = ConfigFactory.load()

ingestion{
  process {
    value = "sas"
  }
  sas {
    origin{
      value = "/route"
    }
    destination{
      value = "/route"
    }
    extension{
      value = ".sas7bdat"
    }
    file{
      value = "mytable"
    }
    month{
      value = "201010,201011"
    }
    table{
      value = "tbl"
    }
  }
}

spark2-submit --class com.bcp.coe.Main --master yarn --deploy-mode client --driver-memory 10G --driver-cores 8 --executor-memory 13G --executor-cores 4 --num-executors 10 --verbose  --files properties.conf /home/s16746/ingestion-1.0-SNAPSHOT-jar-with-dependencies.jar --files application.conf

com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'ingestion'

spark2-submit ...
    --conf spark.driver.extraClassPath=./
    --conf spark.executor.extraClassPath=./      // if you need to load config at executors
    ...

spark2-submit ...
    --conf spark.driver.extraJavaOptions=-Dconfig.file=./application.conf
    --conf spark.executor.extraJavaOptions=-Dconfig.file=./application.conf
    ...