Improved exception handling for indexing

src/Server/Exceptions/SearchdomainExceptions.cs

@@ -0,0 +1,5 @@
+namespace Server.Exceptions;
+
+public class ProbMethodNotFoundException(string probMethod) : Exception($"Unknown probMethod name {probMethod}") { }
+
+public class SimilarityMethodNotFoundException(string similarityMethod) : Exception($"Unknown similarityMethod name \"{similarityMethod}\"") { }