Merge branch '2.2.x'

Closes gh-20712

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/cassandra/CassandraHealthIndicator.java

@@ -16,6 +16,7 @@
 
 package org.springframework.boot.actuate.cassandra;
 
+import com.datastax.oss.driver.api.core.ConsistencyLevel;
 import com.datastax.oss.driver.api.core.cql.ResultSet;
 import com.datastax.oss.driver.api.core.cql.SimpleStatement;
 
@@ -30,10 +31,14 @@ import org.springframework.util.Assert;
  * Cassandra data stores.
  *
  * @author Julien Dubois
+ * @author Alexandre Dutra
  * @since 2.0.0
  */
 public class CassandraHealthIndicator extends AbstractHealthIndicator {
 
+	private static final SimpleStatement SELECT = SimpleStatement
+			.newInstance("SELECT release_version FROM system.local").setConsistencyLevel(ConsistencyLevel.LOCAL_ONE);
+
 	private CassandraOperations cassandraOperations;
 
 	public CassandraHealthIndicator() {