Remove IndexPrefixes from TextProperty test

IndexPrefixes are valid for 6.3.0+ and are tested in a separate test class

Author: russcam

src/Tests/Tests/Mapping/Types/Core/Text/TextPropertyTests.cs

@@ -107,11 +107,6 @@ public TextPropertyTests(WritableCluster cluster, EndpointUsage usage) : base(cl
 						max = 100.00,
 						min_segment_size = 2
 					},
-					index_prefixes = new
-					{
-						min_chars = 1,
-						max_chars = 10
-					},
 					fields = new
 					{
 						raw = new
@@ -149,10 +144,6 @@ public TextPropertyTests(WritableCluster cluster, EndpointUsage usage) : base(cl
 						.Max(100)
 						.MinSegmentSize(2)
 					)
-					.IndexPrefixes(i => i
-						.MinCharacters(1)
-						.MaxCharacters(10)
-					)
 					.Fields(fd => fd
 						.Keyword(k => k
 							.Name("raw")
@@ -186,11 +177,6 @@ public TextPropertyTests(WritableCluster cluster, EndpointUsage usage) : base(cl
 						Max = 100,
 						MinSegmentSize = 2
 					},
-					IndexPrefixes = new TextIndexPrefixes
-					{
-						MinCharacters = 1,
-						MaxCharacters = 10
-					},
 					Fields = new Properties
 					{
 						{ "raw", new KeywordProperty