[es-index-cleaner] Use OTEL helper instead of tlscfg (#6259)

## Which problem is this PR solving?
- Part of #4316 

## Description of the changes
- 

## How was this change tested?
- 

## Checklist
- [ ] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [ ] I have signed all commits
- [ ] I have added unit tests for the new functionality
- [ ] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `yarn lint` and `yarn test`

Signed-off-by: chahatsagarmain <[email protected]>

Author: chahatsagarmain

cmd/es-index-cleaner/app/flags.go

@@ -7,6 +7,9 @@ import (
 	"flag"
 
 	"github.com/spf13/viper"
+	"go.opentelemetry.io/collector/config/configtls"
+
+	"github.com/jaegertracing/jaeger/pkg/config/tlscfg"
 )
 
 const (
@@ -19,6 +22,8 @@ const (
 	password           = "es.password"
 )
 
+var tlsFlagsCfg = tlscfg.ClientFlagsConfig{Prefix: "es"}
+
 // Config holds configuration for index cleaner binary.
 type Config struct {
 	IndexPrefix              string
@@ -29,6 +34,7 @@ type Config struct {
 	Username                 string
 	Password                 string
 	TLSEnabled               bool
+	TLSConfig                configtls.ClientConfig
 }
 
 // AddFlags adds flags for TLS to the FlagSet.
@@ -40,6 +46,7 @@ func (*Config) AddFlags(flags *flag.FlagSet) {
 	flags.String(indexDateSeparator, "-", "Index date separator")
 	flags.String(username, "", "The username required by storage")
 	flags.String(password, "", "The password required by storage")
+	tlsFlagsCfg.AddFlags(flags)
 }
 
 // InitFromViper initializes config from viper.Viper.
@@ -55,4 +62,9 @@ func (c *Config) InitFromViper(v *viper.Viper) {
 	c.IndexDateSeparator = v.GetString(indexDateSeparator)
 	c.Username = v.GetString(username)
 	c.Password = v.GetString(password)
+	opts, err := tlsFlagsCfg.InitFromViper(v)
+	if err != nil {
+		panic(err)
+	}
+	c.TLSConfig = opts.ToOtelClientConfig()
 }

cmd/es-index-cleaner/main.go

@@ -4,6 +4,7 @@
 package main
 
 import (
+	"context"
 	"encoding/base64"
 	"errors"
 	"fmt"
@@ -18,15 +19,13 @@ import (
 
 	"github.com/jaegertracing/jaeger/cmd/es-index-cleaner/app"
 	"github.com/jaegertracing/jaeger/pkg/config"
-	"github.com/jaegertracing/jaeger/pkg/config/tlscfg"
 	"github.com/jaegertracing/jaeger/pkg/es/client"
 )
 
 func main() {
 	logger, _ := zap.NewProduction()
 	v := viper.New()
 	cfg := &app.Config{}
-	tlsFlags := tlscfg.ClientFlagsConfig{Prefix: "es"}
 
 	command := &cobra.Command{
 		Use:   "jaeger-es-index-cleaner NUM_OF_DAYS http://HOSTNAME:PORT",
@@ -42,21 +41,18 @@ func main() {
 			}
 
 			cfg.InitFromViper(v)
-			tlsOpts, err := tlsFlags.InitFromViper(v)
-			if err != nil {
-				return err
-			}
-			tlsCfg, err := tlsOpts.Config(logger)
+
+			ctx := context.Background()
+			tlscfg, err := cfg.TLSConfig.LoadTLSConfig(ctx)
 			if err != nil {
-				return err
+				return fmt.Errorf("error loading tls config : %w", err)
 			}
-			defer tlsOpts.Close()
 
 			c := &http.Client{
 				Timeout: time.Duration(cfg.MasterNodeTimeoutSeconds) * time.Second,
 				Transport: &http.Transport{
 					Proxy:           http.ProxyFromEnvironment,
-					TLSClientConfig: tlsCfg,
+					TLSClientConfig: tlscfg,
 				},
 			}
 			i := client.IndicesClient{
@@ -101,7 +97,6 @@ func main() {
 		v,
 		command,
 		cfg.AddFlags,
-		tlsFlags.AddFlags,
 	)
 
 	if err := command.Execute(); err != nil {