Fix Hikari connection pool configuration.

Fixes PMCSD-26.

Author: gijskant

transmart-api-server/grails-app/conf/application.yml

@@ -47,28 +47,13 @@ dataSource:
     username: biomart_user
     password: biomart_user
     dbCreate: none
-    pooled: true
     jmxExport: true
     logSql: false
     formatql: false
+    pooled: true
     properties:
-        jmxEnabled: true
-        initialSize: 5
-        maxActive: 50
-        minIdle: 5
-        maxIdle: 25
-        maxWait: 10000
-        maxAge: 600000
-        timeBetweenEvictionRunsMillis: 5000
-        minEvictableIdleTimeMillis: 60000
-        validationQuery: SELECT 1
-        validationQueryTimeout: 3
-        validationInterval: 15000
-        testOnBorrow: true
-        testWhileIdle: true
-        testOnReturn: false
-        jdbcInterceptors: ConnectionState
-        defaultTransactionIsolation: 2 # TRANSACTION_READ_COMMITTED
+        minimumIdle: 15
+        maximumPoolSize: 50
 
 grails:
     plugin: