doc.put("content_length", "abc");

        final List<VaMessenger<FessMessages>> errorMessages = new ArrayList<>();
        AdminSearchlistAction.validateFields(doc, errorMessages::add);

        final FessMessages messages = new FessMessages();
        errorMessages.forEach(m -> m.message(messages));

                createFacetQueryView("size", "small", "content_length:[0 TO 10000]", "large", "content_length:[10000 TO *]"));
        final MockHttpServletRequest request = new MockHttpServletRequest();
        request.setParameterValues("ex_q",
                new String[] { "filetype:HTML", "filetype:PDF", "timestamp:[now-1y TO *]", "content_length:[0 TO 10000]" });

            public String getIndexFieldBoost() {
                return "boost";
            }

            @Override
            public String getIndexFieldContentLength() {
                return "content_length";
            }

            @Override
            public String getIndexFieldHost() {
                return "host";
            }

            @Override

                    return "host";
                case FessConfig.INDEX_FIELD_SITE:
                    return "site";
                case FessConfig.INDEX_FIELD_content_length:
                    return "content_length";
                case FessConfig.INDEX_FIELD_FILETYPE:
                    return "filetype";
                case FessConfig.INDEX_FIELD_FILENAME:
                    return "filename";

            public String getIndexFieldBoost() {
                return "boost";
            }

            @Override
            public String getIndexFieldContentLength() {
                return "content_length";
            }

            @Override
            public String getIndexFieldHost() {
                return "host";
            }

            @Override
            public String getIndexFieldSite() {

        }
    }

    @Test
    public void searchTestWithSort() throws Exception {
        String sortField = "content_length";
        Map<String, String> params = new HashMap<>();
        params.put("q", "*");
        params.put("sort", sortField + ".asc");
        params.put("num", "100");

                                    <label for="doc.content_length" class="col-sm-3 text-sm-right col-form-label">content_length</label>
                                    <div class="col-sm-9">
                                        <la:errors property="doc.content_length"/>
                                        <la:text styleId="doc.content_length"
                                                 property="doc.content_length"

            public String getIndexFieldBoost() {
                return "boost";
            }

            @Override
            public String getIndexFieldContentLength() {
                return "content_length";
            }

            @Override
            public String getIndexFieldHost() {
                return "host";
            }

            @Override
            public String getIndexFieldSite() {

                        last_modified:
                          type: string
                          format: date-time
                          example: "2017-10-09T22:28:56.000Z"
                        content_length:
                          type: string
                          example: "29624"
                        timestamp:
                          type: string
                          format: date-time

            public String getIndexFieldBoost() {
                return "boost";
            }

            @Override
            public String getIndexFieldContentLength() {
                return "content_length";
            }

            @Override
            public String getIndexFieldHost() {
                return "host";
            }

            @Override