added highlight_fields property (#241)

Author: agauch

src/Typesense/SearchParameters.cs

@@ -269,6 +269,14 @@ public record SearchParameters
     [JsonPropertyName("highlight_full_fields")]
     public string? HighlightFullFields { get; set; }
 
+    /// <summary>
+    /// Comma separated list of fields that should be highlighted with snippetting.
+    /// Default: all queried fields will be highlighted.
+    /// Set to none to disable snippetting fully.
+    /// </summary>
+    [JsonPropertyName("highlight_fields")]
+    public string? HighlightFields { get; set; }
+
     /// <summary>
     /// The number of tokens that should surround the highlighted text on each side.
     /// </summary>