feat: add flag to disable canary config indexing (#835)

Author: fieldju

kayenta-core/src/main/java/com/netflix/kayenta/index/config/IndexConfiguration.java

@@ -21,13 +21,15 @@
 import com.netflix.kayenta.index.CanaryConfigIndexingAgent;
 import com.netflix.kayenta.security.AccountCredentialsRepository;
 import com.netflix.kayenta.storage.StorageServiceRepository;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
 import redis.clients.jedis.JedisPool;
 
 @Configuration
+@ConditionalOnProperty(name = "kayenta.index.enabled", havingValue = "true", matchIfMissing = true)
 public class IndexConfiguration {
 
   @Bean