Fix mapping (opensearch)

search/time_series.go

@@ -221,6 +221,7 @@ func structMappingProperties(structType reflect.Type) (map[string]MappingPropert
 		}
 
 		// allow user to change that with a search tag on the field
+		skip := false
 		switch structField.Tag.Get("search") {
 		case "":
 			// no change
@@ -235,13 +236,19 @@ func structMappingProperties(structType reflect.Type) (map[string]MappingPropert
 		case "object":
 			fieldMapping.Type = "object"
 			fieldMapping.Enabled = false
+		case "-":
+			// do not include in mapping
+			skip = true
 		default:
 			return nil, errors.Errorf("Unknown search:\"%s\" on field(%s)", structField.Tag.Get("search"), structField.Name)
 		}
 
 		// add to index spec
+		if !skip {
 			properties[fieldName] = fieldMapping
 		}
+
+	}
 	return properties, nil
 }