introduce a new schemaless way

meilisearch-schema/src/error.rs

@@ -5,6 +5,7 @@ pub type SResult<T> = Result<T, Error>;
 
 #[derive(Debug)]
 pub enum Error {
+    FieldNameNotFound(String),
     MaxFieldsLimitExceeded,
 }
 
@@ -12,6 +13,7 @@ impl fmt::Display for Error {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         use self::Error::*;
         match self {
+            FieldNameNotFound(field) => write!(f, "The field {} doesn't exist", field),
             MaxFieldsLimitExceeded => write!(f, "The maximum of possible reatributed field id has been reached"),
         }
     }