public String getIndexFieldExpires() {
                return baseConfig.getIndexFieldExpires();
            }

            @Override
            public String getIndexFieldParentId() {
                return baseConfig.getIndexFieldParentId();
            }

            @Override
            public String getIndexFieldPrimaryTerm() {
                return baseConfig.getIndexFieldPrimaryTerm();
            }

            }

            @Override
            public String getIndexFieldExpires() {
                return "expires";
            }

            @Override
            public String getIndexFieldParentId() {
                return "parent_id";
            }

            @Override
            public String getIndexFieldPrimaryTerm() {
                return "primary_term";
            }

            }

            @Override
            public String getIndexFieldExpires() {
                return "expires";
            }

            @Override
            public String getIndexFieldParentId() {
                return "parent_id";
            }

            @Override
            public String getIndexFieldPrimaryTerm() {
                return "primary_term";
            }

                    fessConfig.getIndexFieldLang(), //
                    fessConfig.getIndexFieldLastModified(), //
                    fessConfig.getIndexFieldMimetype(), //
                    fessConfig.getIndexFieldParentId(), //
                    fessConfig.getIndexFieldPrimaryTerm(), //
                    fessConfig.getIndexFieldRole(), //
                    fessConfig.getIndexFieldSegment(), //

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return searchEngineClient.deleteByQuery(fessConfig.getIndexDocumentUpdateIndex(),
                QueryBuilders.termQuery(fessConfig.getIndexFieldParentId(), id));
    }

    /**
     * Retrieves all child documents that belong to the specified parent document.
     *
     * @param searchEngineClient the search engine client to use for retrieval

     * The value is, e.g. parent_id <br>
     * comment: Field name for parent ID in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldParentId();

    /**
     * Get the value for the key 'index.field.important_content'. <br>
     * The value is, e.g. important_content <br>
     * comment: Field name for important content in the index.