Support Elasticsearch 9.x as storage

.github/workflows/skywalking.yaml

@@ -377,6 +377,9 @@ jobs:
           - name: Storage ES 8.18.8
             config: test/e2e-v2/cases/storage/es/e2e.yaml
             env: ES_VERSION=8.18.8
+          - name: Storage ES 9.3.0
+            config: test/e2e-v2/cases/storage/es/e2e.yaml
+            env: ES_VERSION=9.3.0
           - name: Storage OpenSearch 2.4.0
             config: test/e2e-v2/cases/storage/opensearch/e2e.yaml
             env: OPENSEARCH_VERSION=2.4.0

docs/en/changes/changes.md

@@ -255,6 +255,7 @@
   admin-host only" entry above for the public REST retirement.
 
 #### OAP Server
+* Support Elasticsearch 9.x as storage.
 * Add Node.js runtime metrics via the Node.js agent **`MeterReportService`** pipeline (`meter_instance_nodejs_*`, 1s collect/report). OAP analyzes raw meters through `nodejs-runtime.yaml`. Node.js E2E asserts six `meter_instance_nodejs_*` metrics (`test/e2e-v2/cases/nodejs/e2e.yaml`).
 * Add PHP runtime PHM meter analyzer (`php-runtime.yaml`) for SkyWalking PHP agent process
   metrics (CPU, memory, virtual memory, thread count, open file descriptors sampled from

docs/en/setup/backend/storages/elasticsearch.md

@@ -37,7 +37,7 @@ SkyWalking rebuilds the ElasticSearch client on top of ElasticSearch REST API an
 correct request formats according to the server-side version, hence you don't need to download different binaries
 and don't need to configure different storage selectors for different ElasticSearch server-side versions anymore.
 
-For now, SkyWalking supports ElasticSearch 7.x, ElasticSearch 8.x, and OpenSearch 1.x, their
+For now, SkyWalking supports ElasticSearch 7.x, ElasticSearch 8.x, ElasticSearch 9.x, and OpenSearch 1.x, their
 configurations are as follows:
 
 _Notice, ElasticSearch 6 worked and is not promised due to end of life officially._

oap-server/server-library/library-elasticsearch-client/src/main/java/org/apache/skywalking/library/elasticsearch/ElasticSearchVersion.java

@@ -64,7 +64,7 @@ private ElasticSearchVersion(final String distribution, final int major, final i
                 }
                 return;
             }
-            if (major == 8) {
+            if (major >= 8) { // 8.x, 9.x and later: typeless docs + composable index templates
                 requestFactory = new V81RequestFactory(this);
                 codec = V78Codec.INSTANCE;
                 return;

oap-server/server-library/library-elasticsearch-client/src/test/java/org/apache/skywalking/library/elasticsearch/ElasticSearchIT.java

@@ -90,6 +90,13 @@ public static Collection<Object[]> es() {
                                    .withTag("8.9.0"))
                     .withEnv("xpack.security.enabled", "false")
             },
+            {
+                "ElasticSearch 9.3.0",
+                new ElasticsearchContainer(
+                    DockerImageName.parse("docker.elastic.co/elasticsearch/elasticsearch")
+                                   .withTag("9.3.0"))
+                    .withEnv("xpack.security.enabled", "false")
+            },
             {
                 "OpenSearch 1.0.0",
                 new ElasticsearchContainer(