Support refresh().

Author: kelp404

README.md

@@ -250,6 +250,15 @@ class Document
 # ex: query = Document.where('field', '==': 'value')
 ```
 ```coffee
+@refresh = (args) ->
+    ###
+    Explicitly refresh one or more index.
+    https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/api-reference-5-6.html#api-indices-refresh-5-6
+    @params args {object}
+    @returns {promise}
+    ###
+```
+```coffee
 @updateMapping = ->
     ###
     Update the index mapping.

lib/document.js

@@ -282,6 +282,30 @@
       return query.intersect(field, operation);
     };
 
+    Document.refresh = function(args) {
+      var deferred;
+      if (args == null) {
+        args = {};
+      }
+
+      /*
+      Explicitly refresh one or more index, making all operations performed since the last refresh available for search.
+      https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/api-reference-5-6.html#api-indices-refresh-5-6
+      @params args {object}
+      @returns {promise}
+       */
+      deferred = q.defer();
+      args.index = this.getIndexName();
+      this._es.indices.refresh(args, function(error) {
+        if (error) {
+          deferred.reject(error);
+          return;
+        }
+        return deferred.resolve();
+      });
+      return deferred.promise;
+    };
+
     Document.updateMapping = function() {
 
       /*

src/lib/document.coffee

@@ -199,6 +199,22 @@ module.exports = class Document
         query = new Query(@)
         query.intersect field, operation
 
+    @refresh = (args = {}) ->
+        ###
+        Explicitly refresh one or more index, making all operations performed since the last refresh available for search.
+        https://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/api-reference-5-6.html#api-indices-refresh-5-6
+        @params args {object}
+        @returns {promise}
+        ###
+        deferred = q.defer()
+        args.index = @getIndexName()
+        @_es.indices.refresh args, (error) ->
+            if error
+                deferred.reject error
+                return
+            deferred.resolve()
+        deferred.promise
+
     @updateMapping = ->
         ###
         Update the index mapping.

tests/test-document.coffee

@@ -200,6 +200,23 @@ exports.testDocumentAll = (test) ->
     test.equal query.documentClass, DataModel
     test.done()
 
+exports.testDocumentRefresh = (test) ->
+    class DataModel extends Document
+        @_index = 'index'
+    _es = DataModel._es
+    DataModel._es =
+        indices:
+            refresh: (args, callback) ->
+                test.deepEqual args,
+                    index: 'index'
+                callback null, yes
+
+    test.expect 2
+    DataModel.refresh().then ->
+        test.ok 1
+        test.done()
+    DataModel._es = _es
+
 exports.testDocumentWhere = (test) ->
     class DataModel extends Document
         @_index = 'index'