x-pack/filebeat/input/cel: make http functions always available

CHANGELOG.next.asciidoc

@@ -301,6 +301,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Allow attribute selection in the Active Directory entity analytics provider. {issue}40482[40482] {pull}40662[40662]
 - Improve error quality when CEL program does not correctly return an events array. {pull}40580[40580]
 - Add `use_kubeadm` config option for filebeat (both filbeat.input and autodiscovery) in order to toggle kubeadm-config api requests {pull}40301[40301]
+- Make HTTP library function inclusion non-conditional in CEL input. {pull}40912[40912]
 
 *Auditbeat*
 

x-pack/filebeat/input/cel/config.go

@@ -81,15 +81,11 @@ func (c config) Validate() error {
 		return fmt.Errorf("failed to check regular expressions: %w", err)
 	}
 	// TODO: Consider just building the program here to avoid this wasted work.
-	var client *http.Client
-	if wantClient(c) {
-		client = &http.Client{}
-	}
 	var patterns map[string]*regexp.Regexp
 	if len(c.Regexps) != 0 {
 		patterns = map[string]*regexp.Regexp{".": nil}
 	}
-	_, _, err = newProgram(context.Background(), c.Program, root, client, nil, nil, patterns, c.XSDs, logp.L().Named("input.cel"), nil)
+	_, _, err = newProgram(context.Background(), c.Program, root, &http.Client{}, nil, nil, patterns, c.XSDs, logp.L().Named("input.cel"), nil)
 	if err != nil {
 		return fmt.Errorf("failed to check program: %w", err)
 	}

x-pack/filebeat/input/cel/input.go

@@ -727,9 +727,6 @@
 const lumberjackTimestamp = "[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]T[0-9][0-9]-[0-9][0-9]-[0-9][0-9].[0-9][0-9][0-9]"
 
 func newClient(ctx context.Context, cfg config, log *logp.Logger, reg *monitoring.Registry) (*http.Client, *httplog.LoggingRoundTripper, error) {
-	if !wantClient(cfg) {
-		return nil, nil, nil
-	}
 	c, err := cfg.Resource.Transport.Client(clientOptions(cfg.Resource.URL.URL, cfg.Resource.KeepAlive.settings())...)
 	if err != nil {
 		return nil, nil, err
@@ -1012,14 +1009,12 @@
 		lib.Debug(debug(log, trace)),
 		lib.File(mimetypes),
 		lib.MIME(mimetypes),
+		lib.HTTPWithContext(ctx, client, limiter, auth),
 		lib.Limit(limitPolicies),
 		lib.Globals(map[string]interface{}{
 			"useragent": userAgent,
 		}),
 	}
-	if client != nil {
-		opts = append(opts, lib.HTTPWithContext(ctx, client, limiter, auth))
-	}
 	if len(patterns) != 0 {
 		opts = append(opts, lib.Regexp(patterns))
 	}
@@ -1250,7 +1245,7 @@
 // walkMap walks to all ends of the provided path in m and applies fn to the
 // final element of each walk. Nested arrays are not handled.
 func walkMap(m mapstr.M, path string, fn func(parent mapstr.M, key string)) {
 	key, rest, more := strings.Cut(path, ".")
 	v, ok := m[key]
 	if !ok {
 		return