iterator.remove();
      assertEquals(initialSize - 1, map.size());
      // (We can't assert that the values collection no longer contains the
      // removed value, because the underlying map can have multiple mappings
      // to the same value.)
      assertInvariants(map);
      assertThrows(IllegalStateException.class, iterator::remove);
    } else {
      iterator.next();

    return new HashBiMap<>(expectedSize);
  }

  /**
   * Constructs a new bimap containing initial values from {@code map}. The bimap is created with an
   * initial capacity sufficient to hold the mappings in the specified map.
   */
  public static <K extends @Nullable Object, V extends @Nullable Object> HashBiMap<K, V> create(
      Map<? extends K, ? extends V> map) {
    HashBiMap<K, V> bimap = create(map.size());

    /** Injected helper for data store indexing operations. */
    @Resource
    protected DataIndexHelper dataIndexHelper;

    /** Injected service for managing path mappings during crawling. */
    @Resource
    protected PathMappingService pathMappingService;

    /** Injected service for managing crawling session information. */
    @Resource

      "number_of_replicas": 0,
      "auto_expand_replicas": "${fess.index.auto_expand_replicas}"
    },
    "analysis": {
      "char_filter": {
        "mapping_fa_filter": {
          "type": "mapping",

      "number_of_replicas": 0,
      "auto_expand_replicas": "${fess.index.auto_expand_replicas}"
    },
    "analysis": {
      "char_filter": {
        "mapping_fa_filter": {
          "type": "mapping",

          test.remove(rangeToRemove);
          verify(model, test);
        }
      }
    }
  }

  // identical to testPutTwoAndRemove,
  // verifies that putCoalescing() doesn't cause any mappings to change relative to put()
  public void testPutCoalescingTwoAndRemove() {
    for (Range<Integer> rangeToPut1 : RANGES) {
      for (Range<Integer> rangeToPut2 : RANGES) {

  -u admin:admin \
  --data-binary @fess-documents.json
```

#### Index Settings Migration

Fess uses OpenSearch/Elasticsearch internally, so you can:

1. Export index mappings and settings from source
2. Apply custom analyzers in Fess's `fess_config.properties`
3. Create synonym dictionaries in Fess's dictionary directory

---

### Apache Solr

For migrating from Apache Solr:

        "filter" : ["lowercase", "content_length_filter", "limit_token_count_filter"]
      }
    },
    "char_filter" : {
      "mapping_char" : {
        "type" : "mapping",
        "mappings" : ["ｶﾞ=>ガ", "ｷﾞ=>ギ", "ｸﾞ=>グ", "ｹﾞ=>ゲ", "ｺﾞ=>ゴ", "ｻﾞ=>ザ", "ｼﾞ=>ジ", "ｽﾞ=>ズ", "ｾﾞ=>ゼ", "ｿﾞ=>ゾ", "ﾀﾞ=>ダ", "ﾁﾞ=>ヂ", "ﾂﾞ=>ヅ",

    return createInstance(factory, tentativeArgs).hashCode()
        == createInstance(factory, args).hashCode();
  }

  // distinctValues is a type-safe class-values mapping, but we don't have a type-safe data
  // structure to hold the mappings.
  @SuppressWarnings({"unchecked", "rawtypes"})
  private FreshValueGenerator newFreshValueGenerator() {
    FreshValueGenerator generator =
        new FreshValueGenerator() {

    }

    /**
     * Creates the OpenSearch index mapping for the specified mapping name.
     * If the index doesn't exist, it will be created with the configured number of shards and replicas.
     * If the mapping doesn't exist, it will be created from the JSON file in the mapping directory.
     *
     * @param mappingName The name of the mapping to create.
     */