Fix tests

Author: carlosdelest

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/fulltext/Match.java

@@ -218,7 +218,9 @@ public Fuzziness fuzziness() {
         }
 
         Object fuzinessAsObject = fuzziness.fold();
-        if (fuzinessAsObject instanceof BytesRef bytesRefValue) {
+        if (fuzinessAsObject instanceof String stringValue) {
+            return Fuzziness.fromString(stringValue);
+        } else if (fuzinessAsObject instanceof BytesRef bytesRefValue) {
             return Fuzziness.fromString(bytesRefValue.utf8ToString());
         } else if (fuzinessAsObject instanceof Integer intValue) {
             return Fuzziness.fromEdits(intValue);

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/parser/StatementParserTests.java

@@ -2328,7 +2328,7 @@ public void checkMatchOperatorWithFuzziness(String fuzzinessValue, Fuzziness fuz
         var matchField = (UnresolvedAttribute) match.field();
         assertThat(matchField.name(), equalTo("field"));
         assertThat(match.query().fold(), equalTo("value"));
-        assertNull(match.boost());
+        assertThat(match.boost(), equalTo(1.0));
         assertThat(match.fuzziness(), equalTo(fuzinessExpected));
     }