Failure to connect to Elasticsearch should be logged at an ERROR level

2016-05-18 18:02:46,274 INFO  [pool-5-thread-1]  c.a.b.s.s.i.t.DefaultElasticsearchConnectionTester Testing connection with Elasticsearch failed due to exception
java.util.concurrent.CompletionException: java.net.ConnectException: Connection refused: no further information
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292) ~[na:1.8.0_65]
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308) ~[na:1.8.0_65]
	at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:593) ~[na:1.8.0_65]
	at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577) ~[na:1.8.0_65]
	at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474) ~[na:1.8.0_65]
	at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977) ~[na:1.8.0_65]
	at com.atlassian.elasticsearch.client.apache.httpclient.ApacheRequestExecutor$1.failed(ApacheRequestExecutor.java:144) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.concurrent.BasicFuture.failed(BasicFuture.java:134) ~[bitbucket-search-common-2.0.0.jar:4.4.4]
	at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.failed(AbstractClientExchangeHandler.java:414) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.connectionRequestFailed(AbstractClientExchangeHandler.java:330) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.access$100(AbstractClientExchangeHandler.java:61) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.client.AbstractClientExchangeHandler$1.failed(AbstractClientExchangeHandler.java:373) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.concurrent.BasicFuture.failed(BasicFuture.java:134) ~[bitbucket-search-common-2.0.0.jar:4.4.4]
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalPoolEntryCallback.failed(PoolingNHttpClientConnectionManager.java:503) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.concurrent.BasicFuture.failed(BasicFuture.java:134) ~[bitbucket-search-common-2.0.0.jar:4.4.4]
	at org.apache.http.nio.pool.RouteSpecificPool.failed(RouteSpecificPool.java:165) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.nio.pool.AbstractNIOConnPool.requestFailed(AbstractNIOConnPool.java:541) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.nio.pool.AbstractNIOConnPool$InternalSessionRequestCallback.failed(AbstractNIOConnPool.java:816) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.reactor.SessionRequestImpl.failed(SessionRequestImpl.java:159) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:175) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:147) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:350) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:191) ~[bitbucket-search-common-2.0.0.jar:na]
	at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64) ~[bitbucket-search-common-2.0.0.jar:na]
	at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_65]
Caused by: java.net.ConnectException: Connection refused: no further information
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_65]
	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_65]
	at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:173) ~[bitbucket-search-common-2.0.0.jar:na]
	... 5 common frames omitted