Merge #2297

2297: Feat(Search): Enhance formating search results r=ManyTheFish a=ManyTheFish

Add new settings and change crop_len behavior to count words instead of characters.

- [x] `highlightPreTag`
- [x] `highlightPostTag`
- [x] `cropMarker`
- [x] `cropLength` count word instead of chars
- [x] `cropLength` 0 is now considered as no `cropLength`
- [ ] ~smart crop finding the best matches interval~ (postponed)

Partially fixes  #2214. (no smart crop)


Co-authored-by: ManyTheFish <many@meilisearch.com>

meilisearch-http/tests/search/errors.rs

@@ -36,6 +36,38 @@ async fn search_unexisting_parameter() {
         .await;
 }
 
+#[actix_rt::test]
+async fn search_invalid_highlight_and_crop_tags() {
+    let server = Server::new().await;
+    let index = server.index("test");
+
+    let fields = &["cropMarker", "highlightPreTag", "highlightPostTag"];
+
+    for field in fields {
+        // object
+        index
+            .search(
+                json!({field.to_string(): {"marker": "<crop>"}}),
+                |response, code| {
+                    assert_eq!(code, 400, "field {} passing object: {}", &field, response);
+                    assert_eq!(response["code"], "bad_request");
+                },
+            )
+            .await;
+
+        // array
+        index
+            .search(
+                json!({field.to_string(): ["marker", "<crop>"]}),
+                |response, code| {
+                    assert_eq!(code, 400, "field {} passing array: {}", &field, response);
+                    assert_eq!(response["code"], "bad_request");
+                },
+            )
+            .await;
+    }
+}
+
 #[actix_rt::test]
 async fn filter_invalid_syntax_object() {
     let server = Server::new().await;