public Map<String, String> getFilteredEnvMap(final String keyPattern) {
        final Pattern pattern = Pattern.compile(keyPattern);
        return getEnvMap().entrySet().stream().filter(e -> {
            final String key = e.getKey();
            if (StringUtil.isBlank(key)) {
                return false;
            }
            return pattern.matcher(key).matches();

    String CRAWLER_DOCUMENT_FILE_DEFAULT_INCLUDE_INDEX_PATTERNS = "crawler.document.file.default.include.index.patterns";

    /** The key of the configuration. e.g.  */
    String CRAWLER_DOCUMENT_FILE_DEFAULT_EXCLUDE_INDEX_PATTERNS = "crawler.document.file.default.exclude.index.patterns";

    /** The key of the configuration. e.g.  */
    String CRAWLER_DOCUMENT_FILE_DEFAULT_INCLUDE_SEARCH_PATTERNS = "crawler.document.file.default.include.search.patterns";