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 v := s.pretty; v != nil {
		params.Set("pretty", fmt.Sprint(*v))
	}
	if v := s.human; v != nil {
		params.Set("human", fmt.Sprint(*v))
	}
	if v := s.errorTrace; v != nil {
		params.Set("error_trace", fmt.Sprint(*v))
	}
	if len(s.filterPath) > 0 {
		params.Set("filter_path", strings.Join(s.filterPath, ","))
	}
	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
}
buildURL builds the URL for the operation.
package elastic
import (
	"context"
	"fmt"
	"net/http"
	"net/url"
	"strings"
	"github.com/olivere/elastic/v7/uritemplates"
)
type IndicesFlushService struct {
	client *Client
	pretty     *bool        
	human      *bool        
	errorTrace *bool        
	filterPath []string     
	headers    http.Header  
	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) Pretty(pretty bool) *IndicesFlushService {
	s.pretty = &pretty
	return s
}
func (s *IndicesFlushService) Human(human bool) *IndicesFlushService {
	s.human = &human
	return s
}
func (s *IndicesFlushService) ErrorTrace(errorTrace bool) *IndicesFlushService {
	s.errorTrace = &errorTrace
	return s
}
func (s *IndicesFlushService) FilterPath(filterPath ...string) *IndicesFlushService {
	s.filterPath = filterPath
	return s
}
func (s *IndicesFlushService) Header(name string, value string) *IndicesFlushService {
	if s.headers == nil {
		s.headers = http.Header{}
	}
	s.headers.Add(name, value)
	return s
}
func (s *IndicesFlushService) Headers(headers http.Header) *IndicesFlushService {
	s.headers = headers
	return s
}
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
}