MINOR: Upgrade patch version of ES and Lucene for tests prior to 11.0.x (#543)

* MINOR: Upgrade patch version of ES and Lucene for tests prior to 11.0.x

* MINOR: Declare snakeyaml dependency in test scope

Author: kkonstantine

pom.xml

@@ -39,8 +39,8 @@
     </scm>
 
     <properties>
-        <es.version>2.4.1</es.version>
-        <lucene.version>5.5.2</lucene.version>
+        <es.version>2.4.6</es.version>
+        <lucene.version>5.5.4</lucene.version>
         <hamcrest.version>1.3</hamcrest.version>
         <mockito.version>2.28.2</mockito.version>
         <jest.version>6.3.1</jest.version>
@@ -187,6 +187,7 @@
             <groupId>org.yaml</groupId>
             <artifactId>snakeyaml</artifactId>
             <version>${snakeyaml.version}</version>
+            <scope>test</scope>
         </dependency>
     </dependencies>