public static final String AS_EPQ = "epq";

    /** The parameter for query. */
    public static final String AS_Q = "q";

    /** The parameter for filetype. */
    public static final String AS_FILETYPE = "filetype";

    /** The parameter for sitesearch. */
    public static final String AS_SITESEARCH = "sitesearch";

    /** The parameter for occurrence. */
    public static final String AS_OCCURRENCE = "occt";

					</select>
				</div>
			</div>
			<div class="mb-3 row">
				<label for="as_filetype" class="col-lg-3 col-md-4 col-sm-5 col-12 col-form-label"><la:message
						key="labels.advance_search_filetype"
					/></label>
				<div class="col-lg-5 col-md-8 col-sm-7 col-6">
					<select id="as_filetype" name="as.filetype" class="form-control">

					</select>
				</div>
			</div>
			<div class="mb-3 row">
				<label for="as_filetype" class="col-lg-3 col-md-4 col-sm-5 col-12 col-form-label"><la:message
						key="labels.advance_search_filetype"
					/></label>
				<div class="col-lg-5 col-md-8 col-sm-7 col-6">
					<select id="as_filetype" name="as.filetype" class="form-control">

                    queryBuf.append(' ').append(nq);
                }));
        stream(conditions.get(SearchRequestParams.AS_FILETYPE))
                .of(stream -> stream.filter(q -> StringUtil.isNotBlank(q) && q.length() <= maxQueryLength)
                        .forEach(q -> queryBuf.append(" filetype:\"").append(q.trim()).append('"')));