func (s *IndicesFlushService) Do(ctx context.Context) (*IndicesFlushResponse, error) {
	if err := s.Validate(); err != nil {
		return nil, err
	}
	path, params, err := s.buildURL()
	if err != nil {
		return nil, err
	}
	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
		Method: "POST",
		Path:   path,
		Params: params,
	})
	if err != nil {
		return nil, err
	}
	ret := new(IndicesFlushResponse)
	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
		return nil, err
	}
	return ret, nil
}
Do executes the service.
package elastic
import (
	"context"
	"fmt"
	"net/url"
	"strings"
	"github.com/olivere/elastic/uritemplates"
)
type IndicesFlushService struct {
	client            *Client
	pretty            bool
	index             []string
	force             *bool
	waitIfOngoing     *bool
	ignoreUnavailable *bool
	allowNoIndices    *bool
	expandWildcards   string
}
func NewIndicesFlushService(client *Client) *IndicesFlushService {
	return &IndicesFlushService{
		client: client,
		index:  make([]string, 0),
	}
}
func (s *IndicesFlushService) Index(indices ...string) *IndicesFlushService {
	s.index = append(s.index, indices...)
	return s
}
func (s *IndicesFlushService) Force(force bool) *IndicesFlushService {
	s.force = &force
	return s
}
func (s *IndicesFlushService) WaitIfOngoing(waitIfOngoing bool) *IndicesFlushService {
	s.waitIfOngoing = &waitIfOngoing
	return s
}
func (s *IndicesFlushService) IgnoreUnavailable(ignoreUnavailable bool) *IndicesFlushService {
	s.ignoreUnavailable = &ignoreUnavailable
	return s
}
func (s *IndicesFlushService) AllowNoIndices(allowNoIndices bool) *IndicesFlushService {
	s.allowNoIndices = &allowNoIndices
	return s
}
func (s *IndicesFlushService) ExpandWildcards(expandWildcards string) *IndicesFlushService {
	s.expandWildcards = expandWildcards
	return s
}
func (s *IndicesFlushService) Pretty(pretty bool) *IndicesFlushService {
	s.pretty = pretty
	return s
}
func (s *IndicesFlushService) buildURL() (string, url.Values, error) {
	var err error
	var path string
	if len(s.index) > 0 {
		path, err = uritemplates.Expand("/{index}/_flush", map[string]string{
			"index": strings.Join(s.index, ","),
		})
	} else {
		path = "/_flush"
	}
	if err != nil {
		return "", url.Values{}, err
	}
	params := url.Values{}
	if s.pretty {
		params.Set("pretty", "true")
	}
	if s.force != nil {
		params.Set("force", fmt.Sprintf("%v", *s.force))
	}
	if s.waitIfOngoing != nil {
		params.Set("wait_if_ongoing", fmt.Sprintf("%v", *s.waitIfOngoing))
	}
	if s.ignoreUnavailable != nil {
		params.Set("ignore_unavailable", fmt.Sprintf("%v", *s.ignoreUnavailable))
	}
	if s.allowNoIndices != nil {
		params.Set("allow_no_indices", fmt.Sprintf("%v", *s.allowNoIndices))
	}
	if s.expandWildcards != "" {
		params.Set("expand_wildcards", s.expandWildcards)
	}
	return path, params, nil
}
func (s *IndicesFlushService) Validate() error {
	return nil
}