final Pattern pattern = Pattern.compile("(\\$\\{([\\w\\.]+)\\})");
        final Matcher matcher = pattern.matcher(value);
        while (matcher.find()) {
            final String key = matcher.group(2);
            String replacement = System.getProperty(key);
            if (replacement == null) {
                replacement = matcher.group(1);
            }

            }, validationErrorLambda);
        });
    }

    /**
     * Adds a password validation error message to the messages object based on the error key.
     *
     * @param messages the FessMessages object to add the error to
     * @param errorKey the error key identifying the type of password validation error
     */
    protected void addPasswordValidationError(final FessMessages messages, final String errorKey) {

        val properties = Properties()
        val ret = mutableMapOf<String, MutableList<String>>()
        properties.load(StringReader(content))
        properties.forEach { key, value ->
            val list = ret.getOrDefault(value, mutableListOf())
            list.add(key!!.toString())
            ret[value!!.toString()] = list
        }
        return ret
    }


    interface BuildBucketProvider {

        return doGetConditionQuery();
    }

    // ===================================================================================
    //                                                                         Primary Key
    //                                                                         ===========
    public BoostDocumentRuleCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsBoostDocumentRuleCB cb = this;

        return doGetConditionQuery();
    }

    // ===================================================================================
    //                                                                         Primary Key
    //                                                                         ===========
    public FileAuthenticationCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsFileAuthenticationCB cb = this;

        return doGetConditionQuery();
    }

    // ===================================================================================
    //                                                                         Primary Key
    //                                                                         ===========
    public KeyMatchCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsKeyMatchCB cb = this;

        return doGetConditionQuery();
    }

    // ===================================================================================
    //                                                                         Primary Key
    //                                                                         ===========
    public LabelTypeCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsLabelTypeCB cb = this;

        return doGetConditionQuery();
    }

    // ===================================================================================
    //                                                                         Primary Key
    //                                                                         ===========
    public RequestHeaderCB acceptPK(String id) {
        assertObjectNotNull("id", id);
        BsRequestHeaderCB cb = this;

            final String key = LaFunctions.u(e.getKey());
            stream(e.getValue()).of(stream -> stream.filter(StringUtil::isNotBlank)
                    .forEach(s -> pagingQueryList.add("fields." + key + "=" + LaFunctions.u(s))));
        });
        form.as.entrySet().stream().filter(e -> e.getValue() != null).forEach(e -> {
            final String key = LaFunctions.u(e.getKey());

<%@page pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>
<footer role="contentinfo">
	<div class="container text-center">
		<p class="text-muted">
			<la:message key="labels.footer.copyright" />
		</p>
	</div>