Revert "Fix issue where --insecure didn't propogate to Fleet Server E…

…S connection (#27969)" (#27997)

This reverts commit cbbe8c2.

(cherry picked from commit 88b29b5)

x-pack/elastic-agent/CHANGELOG.next.asciidoc

@@ -87,7 +87,6 @@
 - Add "_monitoring" suffix to monitoring instance names to remove ambiguity with the status command. {issue}25449[25449]
 - Ignore ErrNotExists when fixing permissions. {issue}27836[27836] {pull}27846[27846]
 - Snapshot artifact lookup will use agent.download proxy settings. {issue}27903[27903] {pull}27904[27904]
-- Fix issue where --insecure didn't propogate to Fleet Server ES connection. {pull}27969[27969]
 
 ==== New features
 

x-pack/elastic-agent/pkg/agent/cmd/enroll_cmd.go

@@ -299,7 +299,6 @@ func (c *enrollCmd) fleetServerBootstrap(ctx context.Context) (string, error) {
 		c.options.FleetServer.ConnStr, c.options.FleetServer.ServiceToken,
 		c.options.FleetServer.PolicyID,
 		c.options.FleetServer.Host, c.options.FleetServer.Port,
-		c.options.Insecure,
 		c.options.FleetServer.Cert, c.options.FleetServer.CertKey, c.options.FleetServer.ElasticsearchCA,
 		c.options.FleetServer.Headers,
 		c.options.ProxyURL,
@@ -496,7 +495,6 @@ func (c *enrollCmd) enroll(ctx context.Context, persistentConfig map[string]inte
 			c.options.FleetServer.ConnStr, c.options.FleetServer.ServiceToken,
 			c.options.FleetServer.PolicyID,
 			c.options.FleetServer.Host, c.options.FleetServer.Port,
-			c.options.Insecure,
 			c.options.FleetServer.Cert, c.options.FleetServer.CertKey, c.options.FleetServer.ElasticsearchCA,
 			c.options.FleetServer.Headers,
 			c.options.ProxyURL, c.options.ProxyDisabled, c.options.ProxyHeaders)
@@ -802,7 +800,7 @@ func storeAgentInfo(s saver, reader io.Reader) error {
 
 func createFleetServerBootstrapConfig(
 	connStr, serviceToken, policyID, host string,
-	port uint16, insecure bool,
+	port uint16,
 	cert, key, esCA string,
 	headers map[string]string,
 	proxyURL string,
@@ -860,12 +858,6 @@ func createFleetServerBootstrapConfig(
 			},
 		}
 	}
-	if insecure {
-		if cfg.Server.TLS == nil {
-			cfg.Server.TLS = &tlscommon.Config{}
-		}
-		cfg.Server.TLS.VerificationMode = tlscommon.VerifyNone
-	}
 
 	if localFleetServer {
 		cfg.Client.Transport.Proxy.Disable = true