fixed comments for pr

Author: chernser

client-v2/pom.xml

@@ -133,6 +133,7 @@
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
             <version>2.0.16</version>
+            <scope>test</scope>
         </dependency>
     </dependencies>
 

client-v2/src/main/java/com/clickhouse/client/api/internal/HttpAPIClientHelper.java

@@ -14,7 +14,6 @@
 import com.clickhouse.client.api.http.ClickHouseHttpProto;
 import com.clickhouse.client.api.transport.Endpoint;
 import com.google.common.collect.ImmutableMap;
-import com.google.errorprone.annotations.Immutable;
 import net.jpountz.lz4.LZ4Factory;
 import org.apache.hc.client5.http.ConnectTimeoutException;
 import org.apache.hc.client5.http.classic.methods.HttpPost;
@@ -853,7 +852,7 @@ public static class CustomSSLConnectionFactory extends SSLConnectionSocketFactor
         public CustomSSLConnectionFactory(Map<String, String> sniMapping, SSLContext sslContext, HostnameVerifier hostnameVerifier) {
             super(sslContext, hostnameVerifier);
             this.sniMapping = ImmutableMap.copyOf(sniMapping);
-            this.defaultSNI = sniMapping.get("_default_");
+            this.defaultSNI = sniMapping.get(ClientConfigProperties.DEFAULT_KEY);
         }
 
         @Override