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The following commit(s) were added to refs/heads/main by this push:
     new 442e440e43e6 CAMEL-25706: camel-elasticsearch - bind the basic 
authentication credentials to the cluster nodes
442e440e43e6 is described below

commit 442e440e43e6a0ec45b4e9a29716069a6b78227d
Author: Andrea Cosentino <[email protected]>
AuthorDate: Fri Oct 16 16:58:20 2026 +0200

    CAMEL-25706: camel-elasticsearch - bind the basic authentication 
credentials to the cluster nodes
    
    [CAMEL-25706](https://issues.apache.org/jira/browse/CAMEL-25706): 
`ElasticsearchProducer.createClient()` registered the configured `user` and 
`password` with `AuthScope.ANY`, which matches any host.
    
    - The credentials are now held by a `NodeScopedCredentialsProvider`, which 
offers them only to the nodes the client talks to: the hosts of `hostAddresses` 
and, when `enableSniffer` is set, the nodes the sniffer finds.
    - A node matches on scheme, host name (in any case) and port. A node 
without a port matches the default port of its scheme.
    - The provider reads the nodes from the `RestClient` (`getNodes()`) on each 
lookup, so it follows the nodes the sniffer adds or removes. Every configured 
node keeps receiving the credentials.
    - HttpClient 4's `BasicCredentialsProvider` matches an `AuthScope` on host 
and port only, never on the scheme. The provider therefore checks the origin of 
the scope that HttpClient looks the credentials up with, both preemptively and 
after a challenge.
    - `setCredentials` and `clear` do nothing, because the credentials come 
from the endpoint configuration only. HttpClient calls `setCredentials` for the 
user info of a request URI.
    - A client set with the `client` option is not changed.
    
    Closes #27946
    
    Co-Authored-By: Claude Opus 5.5 <[email protected]>
---
 .../camel/component/es/ElasticsearchProducer.java  |  35 +++++--
 .../es/NodeScopedCredentialsProvider.java          |  81 ++++++++++++++++
 .../es/ElasticsearchProducerCredentialsTest.java   |  83 +++++++++++++++++
 .../es/NodeScopedCredentialsProviderTest.java      | 103 +++++++++++++++++++++
 .../ROOT/pages/camel-4x-upgrade-guide-4_24.adoc    |   7 ++
 5 files changed, 303 insertions(+), 6 deletions(-)

diff --git 
a/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/ElasticsearchProducer.java
 
b/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/ElasticsearchProducer.java
index 20027487a64a..03a6dae53561 100644
--- 
a/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/ElasticsearchProducer.java
+++ 
b/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/ElasticsearchProducer.java
@@ -20,7 +20,11 @@ import java.io.InputStream;
 import java.security.KeyStore;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateFactory;
+import java.util.Collection;
+import java.util.List;
 import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Supplier;
 
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.TrustManagerFactory;
@@ -59,10 +63,9 @@ import org.apache.camel.support.DefaultAsyncProducer;
 import org.apache.camel.support.ResourceHelper;
 import org.apache.camel.util.IOHelper;
 import org.apache.http.HttpHost;
-import org.apache.http.auth.AuthScope;
 import org.apache.http.auth.UsernamePasswordCredentials;
 import org.apache.http.client.CredentialsProvider;
-import org.apache.http.impl.client.BasicCredentialsProvider;
+import org.elasticsearch.client.Node;
 import org.elasticsearch.client.RequestOptions;
 import org.elasticsearch.client.RestClient;
 import org.elasticsearch.client.RestClientBuilder;
@@ -509,14 +512,14 @@ class ElasticsearchProducer extends DefaultAsyncProducer {
 
     private RestClient createClient() {
         final RestClientBuilder builder = 
RestClient.builder(configuration.getHostAddressesList().toArray(new 
HttpHost[0]));
+        // the credentials provider reads the nodes from the client, as the 
sniffer can change them
+        final AtomicReference<RestClient> restClientRef = new 
AtomicReference<>();
 
         builder.setRequestConfigCallback(requestConfigBuilder -> 
requestConfigBuilder
                 
.setConnectTimeout(configuration.getConnectionTimeout()).setSocketTimeout(configuration.getSocketTimeout()));
         builder.setHttpClientConfigCallback(httpClientBuilder -> {
-            if (configuration.getUser() != null && configuration.getPassword() 
!= null) {
-                final CredentialsProvider credentialsProvider = new 
BasicCredentialsProvider();
-                credentialsProvider.setCredentials(AuthScope.ANY,
-                        new 
UsernamePasswordCredentials(configuration.getUser(), 
configuration.getPassword()));
+            CredentialsProvider credentialsProvider = 
createCredentialsProvider(() -> nodeHosts(restClientRef.get()));
+            if (credentialsProvider != null) {
                 
httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
             }
             if (configuration.getSslContextParameters() != null) {
@@ -534,6 +537,7 @@ class ElasticsearchProducer extends DefaultAsyncProducer {
             return httpClientBuilder;
         });
         final RestClient restClient = builder.build();
+        restClientRef.set(restClient);
         if (configuration.isEnableSniffer()) {
             SnifferBuilder snifferBuilder = Sniffer.builder(restClient);
             
snifferBuilder.setSniffIntervalMillis(configuration.getSnifferInterval());
@@ -543,6 +547,25 @@ class ElasticsearchProducer extends DefaultAsyncProducer {
         return restClient;
     }
 
+    /**
+     * Creates the provider of the configured user and password, which offers 
them only to the given nodes, or returns
+     * null when no credentials are configured.
+     */
+    CredentialsProvider createCredentialsProvider(Supplier<? extends 
Collection<HttpHost>> nodes) {
+        if (configuration.getUser() == null || configuration.getPassword() == 
null) {
+            return null;
+        }
+        return new NodeScopedCredentialsProvider(
+                new UsernamePasswordCredentials(configuration.getUser(), 
configuration.getPassword()), nodes);
+    }
+
+    private List<HttpHost> nodeHosts(RestClient restClient) {
+        if (restClient == null) {
+            return configuration.getHostAddressesList();
+        }
+        return restClient.getNodes().stream().map(Node::getHost).toList();
+    }
+
     @Override
     protected void doStop() throws Exception {
         if (client != null) {
diff --git 
a/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/NodeScopedCredentialsProvider.java
 
b/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/NodeScopedCredentialsProvider.java
new file mode 100644
index 000000000000..d4a2fac52a04
--- /dev/null
+++ 
b/components/camel-elasticsearch/src/main/java/org/apache/camel/component/es/NodeScopedCredentialsProvider.java
@@ -0,0 +1,81 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.es;
+
+import java.util.Collection;
+import java.util.function.Supplier;
+
+import org.apache.http.HttpHost;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.Credentials;
+import org.apache.http.client.CredentialsProvider;
+
+/**
+ * Offers the configured credentials only to the nodes of the cluster the 
client talks to: the configured hosts, and the
+ * nodes found by the sniffer when it is enabled. A node matches when the 
scheme, the host name and the port are the
+ * same, the default port of the scheme standing in for a missing one.
+ */
+final class NodeScopedCredentialsProvider implements CredentialsProvider {
+
+    private final Credentials credentials;
+    private final Supplier<? extends Collection<HttpHost>> nodes;
+
+    NodeScopedCredentialsProvider(Credentials credentials, Supplier<? extends 
Collection<HttpHost>> nodes) {
+        this.credentials = credentials;
+        this.nodes = nodes;
+    }
+
+    @Override
+    public Credentials getCredentials(AuthScope authScope) {
+        HttpHost origin = authScope != null ? authScope.getOrigin() : null;
+        if (origin != null) {
+            for (HttpHost node : nodes.get()) {
+                if (sameAuthority(node, origin)) {
+                    return credentials;
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Ignored: the credentials come from the endpoint configuration only. 
HttpClient calls this for the user info of a
+     * request URI.
+     */
+    @Override
+    public void setCredentials(AuthScope authScope, Credentials credentials) {
+        // read-only
+    }
+
+    @Override
+    public void clear() {
+        // read-only
+    }
+
+    private static boolean sameAuthority(HttpHost node, HttpHost origin) {
+        return node.getSchemeName().equalsIgnoreCase(origin.getSchemeName())
+                && node.getHostName().equalsIgnoreCase(origin.getHostName())
+                && effectivePort(node) == effectivePort(origin);
+    }
+
+    private static int effectivePort(HttpHost host) {
+        if (host.getPort() >= 0) {
+            return host.getPort();
+        }
+        return "https".equalsIgnoreCase(host.getSchemeName()) ? 443 : 80;
+    }
+}
diff --git 
a/components/camel-elasticsearch/src/test/java/org/apache/camel/component/es/ElasticsearchProducerCredentialsTest.java
 
b/components/camel-elasticsearch/src/test/java/org/apache/camel/component/es/ElasticsearchProducerCredentialsTest.java
new file mode 100644
index 000000000000..3f619e96bd0b
--- /dev/null
+++ 
b/components/camel-elasticsearch/src/test/java/org/apache/camel/component/es/ElasticsearchProducerCredentialsTest.java
@@ -0,0 +1,83 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.es;
+
+import org.apache.camel.CamelContext;
+import org.apache.camel.impl.DefaultCamelContext;
+import org.apache.http.HttpHost;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.Credentials;
+import org.apache.http.client.CredentialsProvider;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+class ElasticsearchProducerCredentialsTest {
+
+    @Test
+    void offersTheConfiguredCredentialsOnlyToTheConfiguredHosts() throws 
Exception {
+        try (CamelContext context = new DefaultCamelContext()) {
+            context.start();
+            ElasticsearchConfiguration configuration
+                    = configuration(context, 
"es1.example.com:9200,es2.example.com:9201", "elastic", "secret");
+
+            CredentialsProvider provider = new 
ElasticsearchProducer(endpoint(context), configuration)
+                    
.createCredentialsProvider(configuration::getHostAddressesList);
+
+            Credentials credentials = provider.getCredentials(scope("http", 
"es1.example.com", 9200));
+            assertNotNull(credentials);
+            assertEquals("elastic", credentials.getUserPrincipal().getName());
+            assertEquals("secret", credentials.getPassword());
+            assertNotNull(provider.getCredentials(scope("http", 
"es2.example.com", 9201)));
+
+            assertNull(provider.getCredentials(scope("http", 
"other.example.com", 9200)));
+            assertNull(provider.getCredentials(scope("http", 
"es1.example.com", 9201)));
+            assertNull(provider.getCredentials(scope("https", 
"es1.example.com", 9200)));
+        }
+    }
+
+    @Test
+    void createsNoProviderWithoutCredentials() throws Exception {
+        try (CamelContext context = new DefaultCamelContext()) {
+            context.start();
+            ElasticsearchConfiguration configuration = configuration(context, 
"es1.example.com:9200", null, null);
+
+            assertNull(new ElasticsearchProducer(endpoint(context), 
configuration)
+                    
.createCredentialsProvider(configuration::getHostAddressesList));
+        }
+    }
+
+    private static ElasticsearchConfiguration configuration(
+            CamelContext context, String hostAddresses, String user, String 
password) {
+        ElasticsearchComponent component = new ElasticsearchComponent(context);
+        component.setHostAddresses(hostAddresses);
+        component.setUser(user);
+        component.setPassword(password);
+        context.addComponent("elasticsearch", component);
+        return endpoint(context).getConfiguration();
+    }
+
+    private static ElasticsearchEndpoint endpoint(CamelContext context) {
+        return context.getEndpoint("elasticsearch:test-cluster", 
ElasticsearchEndpoint.class);
+    }
+
+    private static AuthScope scope(String scheme, String host, int port) {
+        return new AuthScope(new HttpHost(host, port, scheme), "realm", 
"basic");
+    }
+}
diff --git 
a/components/camel-elasticsearch/src/test/java/org/apache/camel/component/es/NodeScopedCredentialsProviderTest.java
 
b/components/camel-elasticsearch/src/test/java/org/apache/camel/component/es/NodeScopedCredentialsProviderTest.java
new file mode 100644
index 000000000000..b23e2e10ef79
--- /dev/null
+++ 
b/components/camel-elasticsearch/src/test/java/org/apache/camel/component/es/NodeScopedCredentialsProviderTest.java
@@ -0,0 +1,103 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.camel.component.es;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.http.HttpHost;
+import org.apache.http.auth.AuthScope;
+import org.apache.http.auth.Credentials;
+import org.apache.http.auth.UsernamePasswordCredentials;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertSame;
+
+class NodeScopedCredentialsProviderTest {
+
+    private static final Credentials CREDENTIALS = new 
UsernamePasswordCredentials("elastic", "secret");
+
+    private final List<HttpHost> nodes = new ArrayList<>(
+            List.of(new HttpHost("es1.example.com", 9200, "http"),
+                    new HttpHost("es2.example.com", 9243, "https"),
+                    new HttpHost("es3.example.com", -1, "https")));
+
+    private final NodeScopedCredentialsProvider provider = new 
NodeScopedCredentialsProvider(CREDENTIALS, () -> nodes);
+
+    @Test
+    void offersTheCredentialsToEveryNode() {
+        assertSame(CREDENTIALS, provider.getCredentials(scope("http", 
"es1.example.com", 9200)));
+        assertSame(CREDENTIALS, provider.getCredentials(scope("https", 
"es2.example.com", 9243)));
+    }
+
+    @Test
+    void usesTheDefaultPortOfTheSchemeWhenTheNodeHasNone() {
+        assertSame(CREDENTIALS, provider.getCredentials(scope("https", 
"es3.example.com", 443)));
+        assertNull(provider.getCredentials(scope("https", "es3.example.com", 
9200)));
+    }
+
+    @Test
+    void matchesTheHostNameRegardlessOfCase() {
+        assertSame(CREDENTIALS, provider.getCredentials(scope("HTTP", 
"ES1.Example.COM", 9200)));
+    }
+
+    @Test
+    void offersNoCredentialsToAHostThatIsNotANode() {
+        assertNull(provider.getCredentials(scope("http", "other.example.com", 
9200)));
+    }
+
+    @Test
+    void offersNoCredentialsToAnotherPortOrSchemeOfANode() {
+        assertNull(provider.getCredentials(scope("http", "es1.example.com", 
9300)));
+        assertNull(provider.getCredentials(scope("https", "es1.example.com", 
9200)));
+        assertNull(provider.getCredentials(scope("http", "es2.example.com", 
9243)));
+    }
+
+    @Test
+    void followsTheCurrentNodes() {
+        HttpHost sniffed = new HttpHost("es4.example.com", 9200, "http");
+        assertNull(provider.getCredentials(scope("http", "es4.example.com", 
9200)));
+
+        nodes.add(sniffed);
+        assertSame(CREDENTIALS, provider.getCredentials(scope("http", 
"es4.example.com", 9200)));
+
+        nodes.remove(sniffed);
+        assertNull(provider.getCredentials(scope("http", "es4.example.com", 
9200)));
+    }
+
+    @Test
+    void offersNoCredentialsToAScopeWithoutAnOrigin() {
+        assertNull(provider.getCredentials(AuthScope.ANY));
+        assertNull(provider.getCredentials(new AuthScope("es1.example.com", 
9200)));
+        assertNull(provider.getCredentials(null));
+    }
+
+    @Test
+    void ignoresCredentialsSetAfterwards() {
+        provider.setCredentials(scope("http", "other.example.com", 9200), new 
UsernamePasswordCredentials("user", "pass"));
+        assertNull(provider.getCredentials(scope("http", "other.example.com", 
9200)));
+
+        provider.clear();
+        assertSame(CREDENTIALS, provider.getCredentials(scope("http", 
"es1.example.com", 9200)));
+    }
+
+    private static AuthScope scope(String scheme, String host, int port) {
+        // the shape of the scope HttpClient looks the credentials up with, 
preemptively or after a challenge
+        return new AuthScope(new HttpHost(host, port, scheme), "realm", 
"basic");
+    }
+}
diff --git 
a/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_24.adoc 
b/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_24.adoc
index f24b85469360..5378b42f4628 100644
--- a/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_24.adoc
+++ b/docs/user-manual/modules/ROOT/pages/camel-4x-upgrade-guide-4_24.adoc
@@ -878,6 +878,13 @@ camel-http control headers of the message. It did so since 
Camel 4.19, when the
 request now always goes to `httpUri`, as it did before. For the same reason 
the `CamelHttpMethod` and
 `CamelHttpProtocolVersion` headers no longer apply, and the request is always 
a POST.
 
+=== camel-elasticsearch - the credentials are only sent to the nodes of the 
cluster
+
+The `user` and `password` are now offered only to the nodes the client talks 
to: the hosts of `hostAddresses` and,
+when `enableSniffer` is set, the nodes the sniffer finds, matching the scheme, 
host and port. Previously they were
+registered for any host. A request to another host, including the host of a 
node with another scheme or port, is now
+sent without them. A client set with the `client` option is not changed.
+
 === camel-jetty - a multipart text field that occurs several times
 
 A text field of a `multipart/form-data` request that occurs several times (for 
example a group of checkboxes) is now

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