[ML] Add ContextualAI inference service

docs/changelog/134933.yaml

@@ -0,0 +1,5 @@
+pr: 134933 
+summary: Add ContextualAI Rerank Service Implementation to the Inference API 
+area: Machine Learning
+type: enhancement
+issues: []

server/src/main/resources/transport/definitions/referable/contextual_ai_service.csv

@@ -0,0 +1 @@
+9175000

server/src/main/resources/transport/upper_bounds/9.2.csv

@@ -1 +1 @@
-semantic_search_ccs_support,9174000
+contextual_ai_service,9175000

x-pack/plugin/inference/qa/inference-service-tests/src/javaRestTest/java/org/elasticsearch/xpack/inference/InferenceGetServicesIT.java

@@ -59,6 +59,7 @@ public void testGetServicesWithoutTaskType() throws IOException {
                     "azureaistudio",
                     "azureopenai",
                     "cohere",
+                    "contextualai",
                     "deepseek",
                     "elastic",
                     "elasticsearch",
@@ -134,6 +135,7 @@ public void testGetServicesWithRerankTaskType() throws IOException {
                     "alibabacloud-ai-search",
                     "azureaistudio",
                     "cohere",
+                    "contextualai",
                     "elasticsearch",
                     "googlevertexai",
                     "jinaai",

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferencePlugin.java

@@ -127,6 +127,7 @@
 import org.elasticsearch.xpack.inference.services.azureaistudio.AzureAiStudioService;
 import org.elasticsearch.xpack.inference.services.azureopenai.AzureOpenAiService;
 import org.elasticsearch.xpack.inference.services.cohere.CohereService;
+import org.elasticsearch.xpack.inference.services.contextualai.ContextualAiService;
 import org.elasticsearch.xpack.inference.services.custom.CustomService;
 import org.elasticsearch.xpack.inference.services.deepseek.DeepSeekService;
 import org.elasticsearch.xpack.inference.services.elastic.ElasticInferenceService;
@@ -410,6 +411,7 @@ public List<InferenceServiceExtension.Factory> getInferenceServiceFactories() {
             context -> new HuggingFaceService(httpFactory.get(), serviceComponents.get(), context),
             context -> new OpenAiService(httpFactory.get(), serviceComponents.get(), context),
             context -> new CohereService(httpFactory.get(), serviceComponents.get(), context),
+            context -> new ContextualAiService(httpFactory.get(), serviceComponents.get(), context),
             context -> new AzureOpenAiService(httpFactory.get(), serviceComponents.get(), context),
             context -> new AzureAiStudioService(httpFactory.get(), serviceComponents.get(), context),
             context -> new GoogleAiStudioService(httpFactory.get(), serviceComponents.get(), context),

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/contextualai/ContextualAiModel.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.inference.services.contextualai;
+
+import org.elasticsearch.common.settings.SecureString;
+import org.elasticsearch.core.Nullable;
+import org.elasticsearch.inference.ModelConfigurations;
+import org.elasticsearch.inference.ModelSecrets;
+import org.elasticsearch.inference.ServiceSettings;
+import org.elasticsearch.inference.TaskSettings;
+import org.elasticsearch.xpack.inference.external.action.ExecutableAction;
+import org.elasticsearch.xpack.inference.services.RateLimitGroupingModel;
+import org.elasticsearch.xpack.inference.services.ServiceUtils;
+import org.elasticsearch.xpack.inference.services.contextualai.action.ContextualAiActionVisitor;
+import org.elasticsearch.xpack.inference.services.settings.ApiKeySecrets;
+import org.elasticsearch.xpack.inference.services.settings.RateLimitSettings;
+
+import java.net.URI;
+import java.util.Map;
+import java.util.Objects;
+
+public abstract class ContextualAiModel extends RateLimitGroupingModel {
+
+    private final SecureString apiKey;
+    private final ContextualAiRateLimitServiceSettings rateLimitServiceSettings;
+
+    public ContextualAiModel(
+        ModelConfigurations configurations,
+        ModelSecrets secrets,
+        @Nullable ApiKeySecrets apiKeySecrets,
+        ContextualAiRateLimitServiceSettings rateLimitServiceSettings
+    ) {
+        super(configurations, secrets);
+
+        this.rateLimitServiceSettings = Objects.requireNonNull(rateLimitServiceSettings);
+        apiKey = ServiceUtils.apiKey(apiKeySecrets);
+    }
+
+    protected ContextualAiModel(ContextualAiModel model, TaskSettings taskSettings) {
+        super(model, taskSettings);
+
+        rateLimitServiceSettings = model.rateLimitServiceSettings();
+        apiKey = model.apiKey();
+    }
+
+    protected ContextualAiModel(ContextualAiModel model, ServiceSettings serviceSettings) {
+        super(model, serviceSettings);
+
+        rateLimitServiceSettings = model.rateLimitServiceSettings();
+        apiKey = model.apiKey();
+    }
+
+    public SecureString apiKey() {
+        return apiKey;
+    }
+
+    public ContextualAiRateLimitServiceSettings rateLimitServiceSettings() {
+        return rateLimitServiceSettings;
+    }
+
+    public abstract ExecutableAction accept(ContextualAiActionVisitor creator, Map<String, Object> taskSettings);
+
+    public RateLimitSettings rateLimitSettings() {
+        return rateLimitServiceSettings.rateLimitSettings();
+    }
+
+    public int rateLimitGroupingHash() {
+        return apiKey().hashCode();
+    }
+
+    public URI baseUri() {
+        return rateLimitServiceSettings.uri();
+    }
+}

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/contextualai/ContextualAiRateLimitServiceSettings.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.inference.services.contextualai;
+
+import org.elasticsearch.xpack.inference.services.settings.RateLimitSettings;
+
+import java.net.URI;
+
+public interface ContextualAiRateLimitServiceSettings {
+    RateLimitSettings rateLimitSettings();
+
+    URI uri();
+
+    String modelId();
+}

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/contextualai/ContextualAiResponseHandler.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.inference.services.contextualai;
+
+import org.elasticsearch.xpack.inference.external.http.HttpResult;
+import org.elasticsearch.xpack.inference.external.http.retry.BaseResponseHandler;
+import org.elasticsearch.xpack.inference.external.http.retry.ResponseParser;
+import org.elasticsearch.xpack.inference.external.http.retry.RetryException;
+import org.elasticsearch.xpack.inference.external.request.Request;
+import org.elasticsearch.xpack.inference.services.contextualai.response.ContextualAiErrorResponseEntity;
+
+/**
+ * Response handler for ContextualAI API calls.
+ */
+public class ContextualAiResponseHandler extends BaseResponseHandler {
+
+    public ContextualAiResponseHandler(String requestType, ResponseParser parseFunction, boolean supportsStreaming) {
+        super(requestType, parseFunction, ContextualAiErrorResponseEntity::fromResponse, supportsStreaming);
+    }
+
+    @Override
+    protected void checkForFailureStatusCode(Request request, HttpResult result) throws RetryException {
+        if (result.isSuccessfulResponse()) {
+            return;
+        }
+
+        // handle error codes
+        int statusCode = result.response().getStatusLine().getStatusCode();
+        if (statusCode == 500) {
+            throw new RetryException(true, buildError(SERVER_ERROR, request, result));
+        } else if (statusCode > 500) {
+            throw new RetryException(false, buildError(SERVER_ERROR, request, result));
+        } else if (statusCode == 429) {
+            throw new RetryException(true, buildError(RATE_LIMIT, request, result));
+        } else if (statusCode == 401) {
+            throw new RetryException(false, buildError(AUTHENTICATION, request, result));
+        } else if (statusCode >= 300 && statusCode < 400) {
+            throw new RetryException(false, buildError(REDIRECTION, request, result));
+        } else {
+            throw new RetryException(false, buildError(UNSUCCESSFUL, request, result));
+        }
+    }
+}