Squashed commits in #1250 with formatting fixes

fixed formatting changes introduced in #1250

#1249 Changed formatting, added test

#1249 Added File property to SortSearchDescriptor

Author: Nick Peterson

src/Nest/DSL/Search/SortScriptDescriptor.cs

@@ -19,6 +19,9 @@ public interface IScriptSort : ISort
 
 		[JsonProperty(PropertyName = "lang")]
 		string Language { get; set; }
+
+		[JsonProperty(PropertyName = "file")]
+		string File { get; set; }
 	}
 
 	public class ScriptSort : SortBase, IScriptSort
@@ -27,6 +30,7 @@ public class ScriptSort : SortBase, IScriptSort
 		public string Script { get; set; }
 		public Dictionary<string, object> Params { get; set; }
 		public string Language { get; set; }
+		public string File { get; set; }
 	}
 
 	public class SortScriptDescriptor<T> : SortDescriptorBase<T, SortScriptDescriptor<T>>, IScriptSort where T : class
@@ -39,6 +43,8 @@ public class SortScriptDescriptor<T> : SortDescriptorBase<T, SortScriptDescripto
 
 		string IScriptSort.Language { get; set; }
 
+		string IScriptSort.File { get; set; }
+
 		Dictionary<string, object> IScriptSort.Params { get; set; }
 
 		public SortScriptDescriptor<T> Script(string script)
@@ -85,5 +91,11 @@ public SortScriptDescriptor<T> Language(string language)
 			Self.Language = language;
 			return this;
 		}
+
+		public SortScriptDescriptor<T> File(string file)
+		{
+			Self.File = file;
+			return this;
+		}
 	}
 }

src/Tests/Nest.Tests.Unit/Search/Sorting/SortTests.cs

@@ -307,6 +307,47 @@ public void TestSortScript()
 			Assert.True(json.JsonEquals(expected), json);
 		}
 
+		[Test]
+		public void TestSortScriptFile()
+		{
+			var s = new SearchDescriptor<ElasticsearchProject>()
+				.From(0)
+				.Size(10)
+				.SortScript(sort => sort
+					.MissingLast()
+					.Descending()
+					.Mode(SortMode.Average)
+					.File("SortScript")
+					.Params(p => p
+						.Add("factor", 1.1)
+					)
+					.Language("native")
+					.Type("number")
+				);
+			var json = TestElasticClient.Serialize(s);
+			var expected = @"
+                {
+                  from: 0,
+                  size: 10,
+                  sort: [
+                   {
+                      _script: {
+                        type: ""number"",
+                        params: {
+                          factor: 1.1
+                        },
+                        missing: ""_last"",
+                        order: ""desc"",
+                        mode: ""avg"",
+                        lang: ""native"",
+						file: ""SortScript"",
+                      }
+                    }
+                  ]
+                }";
+			Assert.True(json.JsonEquals(expected), json);
+		}
+
 		[Test]
 		public void TestNestedFilter()
 		{