private DownloadBean triggerExport() throws IOException {
        HttpUrl triggerExportUrl = HttpUrl.parse(endpoint)
            .newBuilder()
            .addPathSegment("system")
            .addPathSegment("export")
            .addQueryParameter("download", "true")
            .build();

        Request triggerExportRequest = buildRequest(triggerExportUrl);
        Call exportCall = client.newCall(triggerExportRequest);
        Response exportResponse = exportCall.execute();

        checkStatusOk(exportResponse);

        return OBJECT_MAPPER.readValue(exportResponse.body().string(), DownloadBean.class);
    }
Enrich pre-2.1.0.Final release.

Adds the missing ApiDefinition field to older Apiman export files.

@author Marc Savy {@literal <marc@blackparrotlabs.io>}
migration-assistant/src/main/java/io/apiman/migration/fix_pre_21/EnrichPre21ExportCommand.java