[TEST] make sure number of shard is low in network corruption tests

src/test/java/org/elasticsearch/index/store/CorruptedFileTest.java

@@ -325,6 +325,7 @@ public class CorruptedFileTest extends ElasticsearchIntegrationTest {
 
         assertAcked(prepareCreate("test").setSettings(ImmutableSettings.builder()
                 .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, "0")
+                .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, between(1, 4)) // don't go crazy here it must recovery fast
                 .put(InternalEngine.INDEX_FAIL_ON_CORRUPTION, true)
                 // This does corrupt files on the replica, so we can't check:
                 .put(MockFSDirectoryService.CHECK_INDEX_ON_CLOSE, false)