legacy/src/main/java/thredds/catalog/InvCatalogFactory.java
public MetadataConverterIF getMetadataConverter(String key) {
    if (key == null) return null;
    return metadataConverters.get(key);
  }
public MetadataConverterIF getMetadataConverter(String key) {
    if (key == null) return null;
    return metadataConverters.get(key);
  }
Find the MetadataConverterIF registered for this key
@param key search on this key
@return  MetadataConverterIF else null