feat(maxTimeMS): adding maxTimeMS option to createIndexes and dropInd…

…exes

lib/collection.js

@@ -1608,7 +1608,9 @@ define.classMethod('createIndex', { callback: true, promise: true });
  */
 Collection.prototype.createIndexes = function(indexSpecs, options, callback) {
   if (typeof options === 'function') (callback = options), (options = {});
-  options = options || {};
+
+  options = options ? shallowClone(options) : {};
+  if (typeof options.maxTimeMS !== 'number') delete options.maxTimeMS;
 
   return executeOperation(this.s.topology, createIndexes, [this, indexSpecs, options, callback]);
 };
@@ -1659,6 +1661,7 @@ define.classMethod('createIndexes', { callback: true, promise: true });
  * @param {number} [options.wtimeout=null] The write concern timeout.
  * @param {boolean} [options.j=false] Specify a journal write concern.
  * @param {ClientSession} [options.session] optional session to use for this operation
+ * @param {number} [options.maxTimeMS] Number of miliseconds to wait before aborting the query.
  * @param {Collection~resultCallback} [callback] The command result callback
  * @return {Promise} returns Promise if no callback passed
  */
@@ -1695,12 +1698,15 @@ define.classMethod('dropIndex', { callback: true, promise: true });
  * @method
  * @param {Object} [options] Optional settings
  * @param {ClientSession} [options.session] optional session to use for this operation
+ * @param {number} [options.maxTimeMS] Number of miliseconds to wait before aborting the query.
  * @param {Collection~resultCallback} [callback] The command result callback
  * @return {Promise} returns Promise if no callback passed
  */
 Collection.prototype.dropIndexes = function(options, callback) {
   if (typeof options === 'function') (callback = options), (options = {});
-  options = options || {};
+  options = options ? shallowClone(options) : {};
+
+  if (typeof options.maxTimeMS !== 'number') delete options.maxTimeMS;
 
   return executeOperation(this.s.topology, dropIndexes, [this, options, callback]);
 };