public void setOnErrorStatusConflict(ErrorStatusConflictHandlingStrategy onErrorStatusConflict) {
        this.onErrorStatusConflict = Objects.requireNonNull(onErrorStatusConflict);
    }
Specifies what to do when multiple error responses share the same HTTP status code.

@param onErrorStatusConflict Strategy to use for multiple errors with same status code.
smithy-openapi/src/main/java/software/amazon/smithy/openapi/OpenApiConfig.java