Add AWS Bedrock Amazon Titan Text Premier model support

Author: wmz7year

models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/titan/api/TitanChatBedrockApi.java

@@ -275,7 +275,12 @@ public enum TitanChatModel {
 		/**
 		 * amazon.titan-text-express-v1
 		 */
-		TITAN_TEXT_EXPRESS_V1("amazon.titan-text-express-v1");
+		TITAN_TEXT_EXPRESS_V1("amazon.titan-text-express-v1"),
+
+		/**
+		 * amazon.titan-text-premier-v1:0
+		 */
+		TITAN_TEXT_PREMIER_V1("amazon.titan-text-premier-v1:0");
 
 		private final String id;
 

models/spring-ai-bedrock/src/test/java/org/springframework/ai/bedrock/titan/BedrockTitanChatClientIT.java

@@ -205,7 +205,7 @@ public static class TestConfiguration {
 
 		@Bean
 		public TitanChatBedrockApi titanApi() {
-			return new TitanChatBedrockApi(TitanChatModel.TITAN_TEXT_EXPRESS_V1.id(),
+			return new TitanChatBedrockApi(TitanChatModel.TITAN_TEXT_PREMIER_V1.id(),
 					EnvironmentVariableCredentialsProvider.create(), Region.US_EAST_1.id(), new ObjectMapper(),
 					Duration.ofMinutes(2));
 		}

spring-ai-docs/src/main/antora/modules/ROOT/pages/api/chat/bedrock/bedrock-titan.adoc

@@ -80,7 +80,7 @@ The prefix `spring.ai.bedrock.titan.chat` is the property prefix that configures
 |====
 
 Look at the https://github.com/spring-projects/spring-ai/blob/4839a6175cd1ec89498b97d3efb6647022c3c7cb/models/spring-ai-bedrock/src/main/java/org/springframework/ai/bedrock/titan/api/TitanChatBedrockApi.java#L220[TitanChatBedrockApi#TitanChatModel] for other model IDs.
-Supported values are: `amazon.titan-text-lite-v1` and `amazon.titan-text-express-v1`.
+Supported values are: `amazon.titan-text-lite-v1`, `amazon.titan-text-express-v1` and `amazon.titan-text-premier-v1:0`.
 Model ID values can also be found in the https://docs.aws.amazon.com/bedrock/latest/userguide/model-ids-arns.html[AWS Bedrock documentation for base model IDs].
 
 TIP: All properties prefixed with `spring.ai.bedrock.titan.chat.options` can be overridden at runtime by adding a request specific <<chat-options>> to the `Prompt` call.