*/
    public FesenClient() {
        address = System.getProperty(HTTP_ADDRESS, "localhost:9200").trim();
        final String targets = System.getProperty(TARGET_INDICES);
        if (StringUtil.isNotBlank(targets)) {
            targetIndices = Arrays.stream(targets.split(",")).map(String::trim).toArray(n -> new String[n]);
        }
    }

    /**
     * Sets the address of the OpenSearch instance.

                            }
                        }
                    }

                    parent = parent.getParentNode();
                }
            }

            if (StringUtil.isNotBlank(namespace)) {
                return namespace;
            }
            return "http://crawler.codelibs.org/namespace/" + prefix;
        }

        @Override

            availableSearcherNameSet = Collections.emptySet();
        } else {
            availableSearcherNameSet = StreamUtil.split(value, ",")
                    .get(stream -> stream.map(String::trim).filter(StringUtil::isNotBlank).collect(Collectors.toUnmodifiableSet()));
        }
        if (logger.isDebugEnabled()) {
            logger.debug("Available searchers: names={}", availableSearcherNameSet);
        }
    }

    @Override

     * @return the thumbnail file or null if not found
     */
    public File getThumbnailFile(final Map<String, Object> docMap) {
        final String thumbnailPath = getImageFilename(docMap);
        if (StringUtil.isNotBlank(thumbnailPath)) {
            final File file = new File(baseDir, thumbnailPath);
            if (file.isFile()) {
                return file;
            }
        }
        return null;
    }

            final Integer size, final SortBuilder<?>... sortBuilders) {
        return getList(clazz, builder -> {
            if (StringUtil.isNotBlank(sessionId)) {
                if (queryBuilder instanceof BoolQueryBuilder) {
                    ((BoolQueryBuilder) queryBuilder).filter(QueryBuilders.termQuery(SESSION_ID, sessionId));
                } else {