Fix system index test

Author: carlosdelest

server/src/test/java/org/elasticsearch/search/TelemetryMetrics/ShardSearchPhaseAPMMetricsTests.java

@@ -203,6 +203,7 @@ public Collection<SystemIndexDescriptor> getSystemIndexDescriptors(Settings sett
                         """)
                     .setThreadPools(ExecutorNames.DEFAULT_SYSTEM_INDEX_THREAD_POOLS)
                     .setOrigin(ShardSearchPhaseAPMMetricsTests.class.getSimpleName())
+                    .setVersionMetaKey("version")
                     .build()
             );
         }