Added KibanaContainer (#11493)

Co-authored-by: Kevin Wittek <kiview@users.noreply.github.com>

Author: pioorg

docs/modules/elasticsearch.md

@@ -30,6 +30,33 @@ You can turn on security by providing a password:
 [HttpClient](../../modules/elasticsearch/src/test/java/org/testcontainers/elasticsearch/ElasticsearchContainerTest.java) inside_block:httpClientSecuredContainer
 <!--/codeinclude-->
 
+## Kibana container
+
+This module also provides a `KibanaContainer` for testing with [Kibana](https://www.elastic.co/kibana).
+Kibana requires a connection to Elasticsearch and `KibanaContainer` supports two modes: managed and external.
+
+### Managed mode
+
+In managed mode, `KibanaContainer` automatically connects to an `ElasticsearchContainer`:
+
+<!--codeinclude-->
+[Kibana with Elasticsearch](../../modules/elasticsearch/src/test/java/org/testcontainers/elasticsearch/KibanaContainerTest.java) inside_block:managedModeCanStartAndReachElasticsearchInSameExplicitNetwork
+<!--/codeinclude-->
+
+When using managed mode with explicit networks, both containers must share the same `Network` instance.
+Alternatively, you can omit the network configuration entirely, and `KibanaContainer` will do its best effort to create a shared, ad-hoc network automatically.
+
+### External mode
+
+In external mode, `KibanaContainer` connects to an external Elasticsearch instance via URL and using provided credentials:
+
+<!--codeinclude-->
+[Kibana with external Elasticsearch](../../modules/elasticsearch/src/test/java/org/testcontainers/elasticsearch/KibanaContainerTest.java) inside_block:externalModeCanWorkWithUsernamePassword
+<!--/codeinclude-->
+
+For external mode with HTTPS, use `withElasticsearchCaCertificate()` to provide the CA certificate.
+You can authenticate using either username/password (`withElasticsearchCredentials()`) or service account tokens (`withElasticsearchServiceAccountToken()`).
+
 ## Adding this module to your project dependencies
 
 Add the following dependency to your `pom.xml`/`build.gradle` file:

modules/elasticsearch/src/main/java/org/testcontainers/elasticsearch/ElasticsearchContainer.java

@@ -209,10 +209,99 @@ public ElasticsearchContainer withCertPath(String certPath) {
         return this;
     }
 
+    String getCertPath() {
+        return certPath;
+    }
+
     public String getHttpHostAddress() {
         return getHost() + ":" + getMappedPort(ELASTICSEARCH_DEFAULT_PORT);
     }
 
+    /**
+     * Checks env first if this implies HTTP/HTTPS.
+     * Otherwise, detects the scheme used by Elasticsearch using <code>curl</code>
+     *
+     * @return "http" or "https"
+     */
+    String getHttpScheme() {
+        String securityEnabled = getEnvMap().get("xpack.security.enabled");
+        String httpSslEnabled = getEnvMap().get("xpack.security.http.ssl.enabled");
+
+        // Respect explicit user config
+        if ("false".equalsIgnoreCase(securityEnabled) || "false".equalsIgnoreCase(httpSslEnabled)) {
+            return "http";
+        }
+        if ("true".equalsIgnoreCase(httpSslEnabled)) {
+            return "https";
+        }
+
+        if (!isRunning()) {
+            throw new IllegalStateException(
+                "Cannot determine HTTP scheme: environment variables are not set and container is not running for curl probe"
+            );
+        }
+
+        ExecResult httpsResult = null;
+        ExecResult httpResult = null;
+        try {
+            // HTTPS probe: any HTTP response (200/401/403/...) => scheme is HTTPS.
+            // http_code == 000 means we didn't get an HTTP response (TLS/connect failure/timeout).
+            httpsResult =
+                execInContainer(
+                    "curl",
+                    "-sS",
+                    "-k",
+                    "--connect-timeout",
+                    "2",
+                    "--max-time",
+                    "4",
+                    "-o",
+                    "/dev/null",
+                    "-w",
+                    "%{http_code}",
+                    "https://localhost:" + ELASTICSEARCH_DEFAULT_PORT + "/"
+                );
+            if (httpsResult.getExitCode() == 0 && !"000".equals(httpsResult.getStdout().trim())) {
+                return "https";
+            }
+
+            // HTTP probe
+            httpResult =
+                execInContainer(
+                    "curl",
+                    "-sS",
+                    "--connect-timeout",
+                    "2",
+                    "--max-time",
+                    "4",
+                    "-o",
+                    "/dev/null",
+                    "-w",
+                    "%{http_code}",
+                    "http://localhost:" + ELASTICSEARCH_DEFAULT_PORT + "/"
+                );
+            if (httpResult.getExitCode() == 0 && !"000".equals(httpResult.getStdout().trim())) {
+                return "http";
+            }
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to detect protocol via curl", e);
+        }
+
+        throw new RuntimeException(
+            String.format(
+                "Failed to detect protocol via curl. Both HTTPS and HTTP probes failed. " +
+                "HTTPS probe - exit code: %d, stdout: %s, stderr: %s; " +
+                "HTTP probe - exit code: %d, stdout: %s, stderr: %s",
+                httpsResult.getExitCode(),
+                httpsResult.getStdout(),
+                httpsResult.getStderr(),
+                httpResult.getExitCode(),
+                httpResult.getStdout(),
+                httpResult.getStderr()
+            )
+        );
+    }
+
     // The TransportClient will be removed in Elasticsearch 8. No need to expose this port anymore in the future.
     @Deprecated
     public InetSocketAddress getTcpHost() {