Name:   "idx_user_indices_name",
			Fields: []schema.IndexOption{{Field: &schema.Field{Name: "Name"}}},
		},
		{
			Name:   "idx_name",
			Class:  "UNIQUE",
			Fields: []schema.IndexOption{{Field: &schema.Field{Name: "Name2", UniqueIndex: "idx_name"}}},
		},
		{
			Name:  "idx_user_indices_name3",
			Type:  "btree",
			Where: "name3 != 'jinzhu'",
			Fields: []schema.IndexOption{{
				Field:   &schema.Field{Name: "Name3"},

    }

    /**
     * Increases the indentation level for nested logging.
     */
    public void indent() {
        indentLevel++;
    }

    /**
     * Decreases the indentation level for nested logging.
     */
    public void unindent() {
        if (indentLevel > 0) {
            indentLevel--;
        }
    }

    /**
     * Sets the indentation string to use (e.g., "  ", "    ", "\t").
     */

        return render("");
    }

    public String render(String indentation) {
        if (messages.isEmpty()) {
            return indentation + "There were no validation errors.";
        }

        StringBuilder message = new StringBuilder();
        for (int i = 0; i < messages.size(); i++) {
            message.append(indentation)
                    .append('[')
                    .append(i)

	Type    string // btree, hash, gist, spgist, gin, and brin
	Where   string
	Comment string
	Option  string        // WITH PARSER parser_name
	Fields  []IndexOption // Note: IndexOption's Field maybe the same
}

type IndexOption struct {
	*Field
	Expression string
	Sort       string // DESC, ASC
	Collate    string
	Length     int
	Priority   int
}

// ParseIndexes parse schema indexes

            return primaryTerm;
        }

        public DocMeta indexOption(RequestOptionCall<IndexRequestBuilder> builder) {
            this.indexOption = builder;
            return this;
        }

        public RequestOptionCall<IndexRequestBuilder> indexOption() {
            return indexOption;
        }

        public DocMeta deleteOption(RequestOptionCall<DeleteRequestBuilder> builder) {

            return primaryTerm;
        }

        public DocMeta indexOption(RequestOptionCall<IndexRequestBuilder> builder) {
            this.indexOption = builder;
            return this;
        }

        public RequestOptionCall<IndexRequestBuilder> indexOption() {
            return indexOption;
        }

        public DocMeta deleteOption(RequestOptionCall<DeleteRequestBuilder> builder) {

        if (id != null) {
            builder.setId(id);
        }
        final RequestOptionCall<IndexRequestBuilder> indexOption = esEntity.asDocMeta().indexOption();
        if (indexOption != null) {
            indexOption.callback(builder);
        }
        return builder;
    }

    @Override

import org.junit.AfterClass;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import org.opensearch.action.bulk.BulkRequestBuilder;
import org.opensearch.action.index.IndexAction;
import org.opensearch.action.index.IndexRequestBuilder;
import org.opensearch.index.IndexNotFoundException;
import org.opensearch.search.sort.SortBuilders;
import org.opensearch.search.sort.SortOrder;

        entity.asDocMeta().indexOption(opLambda);
        doInsert(entity, null);
    }

    public void update(FailureUrl entity) {
        doUpdate(entity, null);
    }

    public void update(FailureUrl entity, RequestOptionCall<IndexRequestBuilder> opLambda) {
        entity.asDocMeta().indexOption(opLambda);
        doUpdate(entity, null);
    }

        entity.asDocMeta().indexOption(opLambda);
        doInsert(entity, null);
    }

    public void update(RequestHeader entity) {
        doUpdate(entity, null);
    }

    public void update(RequestHeader entity, RequestOptionCall<IndexRequestBuilder> opLambda) {
        entity.asDocMeta().indexOption(opLambda);
        doUpdate(entity, null);
    }