fix maven to work at all

Original commit: elastic/x-pack-elasticsearch@28f61700e6

pom.xml

@@ -241,6 +241,11 @@
             <url>http://download.java.net/maven/2/</url>
             <layout>default</layout>
         </repository>
+        <repository>
+            <id>oss-snapshots</id>
+            <name>Sonatype OSS Snapshots</name>
+            <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
+        </repository>
     </repositories>
 
     <build>