private static void createTestIndex() throws Exception {
        // Create index with custom analyzers
        Settings indexSettings = Settings.builder()
                .put("number_of_shards", 1)
                .put("number_of_replicas", 0)
                .put("analysis.analyzer.test_reading_analyzer.type", "custom")
                .put("analysis.analyzer.test_reading_analyzer.tokenizer", "standard")

    }

    /**
     * Sets the number of replicas for the OpenSearch index.
     *
     * @param numberOfReplicas The number of replicas.
     */
    public void setNumberOfReplicas(final int numberOfReplicas) {
        this.numberOfReplicas = numberOfReplicas;
    }

    /**
     * Sets the prefix length for generated document IDs.
     *
     * @param idPrefixLength The prefix length.

{
  "settings": {
    "index": {
      "codec": "${fess.index.codec}",
      "refresh_interval": "1s",
      "number_of_shards": "${fess.index.number_of_shards}",
      "number_of_replicas": 0,
      "auto_expand_replicas": "${fess.index.auto_expand_replicas}"
    },
    "analysis": {
      "char_filter": {
        "mapping_fa_filter": {
          "type": "mapping",
          "mappings_path": "${fess.dictionary.path}fa/mapping.txt"
        },

index.document.crawler.filter.number_of_shards=10
# Number of replicas for crawler queue index.
index.document.crawler.queue.number_of_replicas=1
# Number of replicas for crawler data index.
index.document.crawler.data.number_of_replicas=1
# Number of replicas for crawler filter index.
index.document.crawler.filter.number_of_replicas=1
# Index name for configuration data.
index.config.index=fess_config
# Index name for user data.

    /** The key of the configuration. e.g. 1 */
    String INDEX_DOCUMENT_CRAWLER_DATA_number_of_replicas = "index.document.crawler.data.number_of_replicas";

    /** The key of the configuration. e.g. 1 */
    String INDEX_DOCUMENT_CRAWLER_FILTER_number_of_replicas = "index.document.crawler.filter.number_of_replicas";

{
  "settings": {
    "index": {
      "codec": "${fess.index.codec}",
      "refresh_interval": "1s",
      "number_of_shards": "${fess.index.number_of_shards}",
      "number_of_replicas": 0,
      "auto_expand_replicas": "${fess.index.auto_expand_replicas}"
    },
    "analysis": {
      "char_filter": {
        "mapping_fa_filter": {
          "type": "mapping",