fix #1359 randomscore now accepts strings

Author: Mpdreamz

src/Nest/CommonAbstractions/Infer/ExpressionVisitor.cs

@@ -9,7 +9,7 @@ namespace Nest
 	/// This comes from Matt Warren's sample:
 	/// http://blogs.msdn.com/mattwar/archive/2007/07/31/linq-building-an-iqueryable-provider-part-ii.aspx
 	/// </summary>
-	public abstract class ExpressionVisitor
+	public abstract class ExpressionVisitor 
 	{
 		public virtual Expression Visit(Expression exp, Stack<string> stack, Stack<ElasticsearchPropertyAttribute> properties)
 		{

src/Nest/QueryDsl/Compound/FunctionScore/Functions/Random/RandomScoreFunction.cs

@@ -7,20 +7,21 @@ namespace Nest
 	public interface IRandomScoreFunction : IScoreFunction
 	{
 		[JsonProperty(PropertyName = "seed")]
-		int? Seed { get; set; }
+		Union<long, string> Seed { get; set; }
 	}
 
 	public class RandomScoreFunction: FunctionScoreFunctionBase, IRandomScoreFunction
 	{
-		public int? Seed { get; set; }
+		public Union<long, string> Seed { get; set; }
 	}
 
 	public class RandomScoreFunctionDescriptor<T> : FunctionScoreFunctionBaseDescriptor<RandomScoreFunctionDescriptor<T>, IRandomScoreFunction,T>, IRandomScoreFunction
 		where T : class
 	{
-		int? IRandomScoreFunction.Seed { get; set; }
+		Union<long, string> IRandomScoreFunction.Seed { get; set; }
 
-		public RandomScoreFunctionDescriptor<T> Seed(int? seed) => Assign(a => a.Seed = seed);
+		public RandomScoreFunctionDescriptor<T> Seed(long? seed) => Assign(a => a.Seed = seed);
+		public RandomScoreFunctionDescriptor<T> Seed(string seed) => Assign(a => a.Seed = seed);
 
 	}
 }

src/Nest/QueryDsl/Compound/FunctionScore/Functions/ScoreFunctions.cs

@@ -44,7 +44,9 @@ public ScoreFunctionsDescriptor<T> FieldValueFactor(Func<FieldValueFactorFunctio
 		public ScoreFunctionsDescriptor<T> RandomScore(Func<RandomScoreFunctionDescriptor<T>, IRandomScoreFunction> selector) =>
 			Assign(a => a.AddIfNotNull(selector?.Invoke(new RandomScoreFunctionDescriptor<T>())));
 
-		public ScoreFunctionsDescriptor<T> RandomScore(int? seed) => Assign(a => a.AddIfNotNull(new RandomScoreFunction { Seed = seed }));
+		public ScoreFunctionsDescriptor<T> RandomScore(long? seed) => Assign(a => a.AddIfNotNull(new RandomScoreFunction { Seed = seed }));
+
+		public ScoreFunctionsDescriptor<T> RandomScore(string seed) => Assign(a => a.AddIfNotNull(new RandomScoreFunction { Seed = seed }));
 
 		public ScoreFunctionsDescriptor<T> Weight(Func<WeightFunctionDescriptor<T>, IWeightFunction> selector) =>
 			Assign(a => a.AddIfNotNull(selector?.Invoke(new WeightFunctionDescriptor<T>())));

src/Nest/Search/Search/SearchRequest.cs

@@ -84,6 +84,7 @@ public partial interface ISearchRequest : ICovariantSearchRequest
 
 		bool? IgnoreUnavalable { get; }
 	}
+
 	public partial interface ISearchRequest<T> : ISearchRequest { }
 
 	public partial class SearchRequest

src/Tests/QueryDsl/Compound/FunctionScore/FunctionScoreQueryUsageTests.cs

@@ -60,6 +60,7 @@ public FunctionScoreQueryUsageTests(ReadOnlyCluster i, EndpointUsage usage) : ba
 						}
 					},
 					new { random_score = new { seed = 1337 } },
+					new { random_score = new { seed = "randomstring" } },
 					new { weight = 1.0 },
 					new {
 						script_score = new {
@@ -98,6 +99,7 @@ public FunctionScoreQueryUsageTests(ReadOnlyCluster i, EndpointUsage usage) : ba
 					Field = "x", Factor = 1.1,	Missing = 0.1, Modifier = FieldValueFactorModifier.Ln
 				},
 				new RandomScoreFunction { Seed = 1337 },
+				new RandomScoreFunction { Seed = "randomstring" },
 				new WeightFunction { Weight = 1.0},
 				new ScriptScoreFunction { Script = new ScriptQuery { File = "x" } }
 			}
@@ -118,6 +120,7 @@ protected override QueryContainer QueryFluent(QueryContainerDescriptor<Project>
 					.LinearGeoLocation(b => b.Field(p => p.Location).Origin(new GeoLocation(70, -70)).Scale(Distance.Miles(1)).MultiValueMode(MultiValueMode.Average))
 					.FieldValueFactor(b => b.Field("x").Factor(1.1).Missing(0.1).Modifier(FieldValueFactorModifier.Ln))
 					.RandomScore(1337)
+					.RandomScore("randomstring")
 					.Weight(1.0)
 					.ScriptScore(ss => ss.Script(s => s.File("x")))
 				)