}

            @Override
            public String getIndexFieldVersion() {
                return "_version";
            }

            @Override
            public String getIndexFieldSeqNo() {
                return "_seq_no";
            }

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

            form.doc = fessConfig.convertToEditableDoc(entity);
            form.id = (String) entity.remove(fessConfig.getIndexFieldId());
            form.seqNo = (Long) entity.remove(fessConfig.getIndexFieldSeqNo());
            form.primaryTerm = (Long) entity.remove(fessConfig.getIndexFieldPrimaryTerm());
        }).orElse(() -> {

                docMap.put(fessConfig.getIndexFieldId(), hit.getId());
                docMap.put(fessConfig.getIndexFieldVersion(), hit.getVersion());
                docMap.put(fessConfig.getIndexFieldSeqNo(), hit.getSeqNo());
                docMap.put(fessConfig.getIndexFieldPrimaryTerm(), hit.getPrimaryTerm());
                return docMap;
            }

     * comment: Field name for sequence number in the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexFieldSeqNo();

    /**
     * Get the value for the key 'index.field.primary_term'. <br>
     * The value is, e.g. _primary_term <br>
     * comment: Field name for primary term in the index.