fix killCursor issue

Author: emadum

lib/core/wireprotocol/kill_cursors.js

@@ -8,9 +8,12 @@ const maxWireVersion = require('../utils').maxWireVersion;
 const emitWarning = require('../utils').emitWarning;
 const command = require('./command');
 
-function killCursors(server, ns, cursorState, options, callback) {
+function killCursors(server, ns, cursorState, defaultOptions, callback) {
+  if (typeof defaultOptions === 'function') {
+    callback = defaultOptions;
+    defaultOptions = {};
+  }
   callback = typeof callback === 'function' ? callback : () => {};
-  options = options || {};
 
   const cursorId = cursorState.cursorId;
 
@@ -47,6 +50,7 @@ function killCursors(server, ns, cursorState, options, callback) {
     cursors: [cursorId]
   };
 
+  const options = defaultOptions || {};
   if (typeof cursorState.session === 'object') options.session = cursorState.session;
 
   command(server, ns, killCursorCmd, options, (err, result) => {