15:15:13,383 ERROR [stderr] (ESRegistryCacheInvalidator) Exception in thread "ESRegistryCacheInvalidator" java.lang.RuntimeException: java.lang.NullPointerException
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.AbstractClientFactory.initializeClient(AbstractClientFactory.java:75)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.DefaultESClientFactory.createJestClient(DefaultESClientFactory.java:121)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.DefaultESClientFactory.createClient(DefaultESClientFactory.java:68)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.AbstractESComponent.createClient(AbstractESComponent.java:61)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.AbstractESComponent.getClient(AbstractESComponent.java:51)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.PollCachingESRegistry.checkCacheVersion(PollCachingESRegistry.java:204)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.PollCachingESRegistry$6.run(PollCachingESRegistry.java:180)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at java.lang.Thread.run(Thread.java:748)
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) Caused by: java.lang.NullPointerException
15:15:13,384 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.AbstractClientFactory.indexAlreadyExistsException(AbstractClientFactory.java:110)
15:15:13,385 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.AbstractClientFactory.createIndex(AbstractClientFactory.java:94)
15:15:13,421 ERROR [stderr] (ESRegistryCacheInvalidator) 	at io.apiman.gateway.engine.es.AbstractClientFactory.initializeClient(AbstractClientFactory.java:71)
15:15:13,421 ERROR [stderr] (ESRegistryCacheInvalidator) 	... 7 more