make override optional

Author: Nick Grippin

persistence-model/src/main/resources/application.conf

@@ -70,7 +70,7 @@ cassandra-journal {
   contact-points = ["127.0.0.1"]
   contact-points = [${?CASSANDRA_CLUSTER_HOSTS}]
   keyspace = "hmda_journal"
-  keyspace = ${CASSANDRA_JOURNAL_KEYSPACE}
+  keyspace = ${?CASSANDRA_JOURNAL_KEYSPACE}
   table = "journal"
   keyspace-autocreate = true
   keyspace-autocreate-retries = 5
@@ -83,7 +83,7 @@ cassandra-snapshot-store {
   contact-points = ["127.0.0.1"]
   contact-points = [${?CASSANDRA_CLUSTER_HOSTS}]
   keyspace = "hmda_snapshot"
-  keyspace = ${CASSANDRA_SNAPSHOT_KEYSPACE}
+  keyspace = ${?CASSANDRA_SNAPSHOT_KEYSPACE}
   table = "snapshot"
   keyspace-autocreate = true
   keyspace-autocreate-retries = 5

query/src/main/resources/application.conf

@@ -37,7 +37,7 @@ cassandra {
   port = 9042
   port = ${CASSANDRA_CLUSTER_PORT}
   keyspace = "hmda_query"
-  keyspace = ${CASSANDRA_QUERY_KEYSPACE}
+  keyspace = ${?CASSANDRA_QUERY_KEYSPACE}
   retries = 60
   retry-interval = 1000
 }