Remove deprecated output parser in favour of converter across the project

 All output parser functionality has already been migrated to the converter package
 since milestone M1.

 Changes:
 - Replace all instances of 'parser' with 'converter' in variable names and test cases
 - Delete (pre M1) deprecated parser package and all associated classes
 - Remove Output Parsers section from README.md
 - Update Javadoc comments to reference converters instead of parsers

Author: tzolov

README.md

@@ -43,7 +43,6 @@ You can find more details in the [Reference Documentation](https://docs.spring.i
 
 Please refer to the [Getting Started Guide](https://docs.spring.io/spring-ai/reference/getting-started.html) for instruction on adding your dependencies.
 
-
 ## Cloning the repo
 
 This repository contains [large model files](https://github.com/spring-projects/spring-ai/tree/main/models/spring-ai-transformers/src/main/resources/onnx/all-MiniLM-L6-v2).

models/spring-ai-azure-openai/src/test/java/org/springframework/ai/azure/openai/AzureOpenAiChatModelIT.java

@@ -187,9 +187,9 @@ void beanOutputConverterRecords() {
 	@Test
 	void beanStreamOutputConverterRecords() {
 
-		BeanOutputConverter<ActorsFilmsRecord> outputParser = new BeanOutputConverter<>(ActorsFilmsRecord.class);
+		BeanOutputConverter<ActorsFilmsRecord> converter = new BeanOutputConverter<>(ActorsFilmsRecord.class);
 
-		String format = outputParser.getFormat();
+		String format = converter.getFormat();
 		String template = """
 				Generate the filmography of 5 movies for Tom Hanks.
 				{format}
@@ -208,7 +208,7 @@ void beanStreamOutputConverterRecords() {
 			.filter(Objects::nonNull)
 			.collect(Collectors.joining());
 
-		ActorsFilmsRecord actorsFilms = outputParser.convert(generationTextFromStream);
+		ActorsFilmsRecord actorsFilms = converter.convert(generationTextFromStream);
 		logger.info("" + actorsFilms);
 		assertThat(actorsFilms.actor()).isEqualTo("Tom Hanks");
 		assertThat(actorsFilms.movies()).hasSize(5);

models/spring-ai-bedrock/src/test/java/org/springframework/ai/bedrock/anthropic/BedrockAnthropicChatModelIT.java

@@ -111,9 +111,9 @@ void roleTest() {
 	@Test
 	void listOutputConverter() {
 		DefaultConversionService conversionService = new DefaultConversionService();
-		ListOutputConverter outputParser = new ListOutputConverter(conversionService);
+		ListOutputConverter converter = new ListOutputConverter(conversionService);
 
-		String format = outputParser.getFormat();
+		String format = converter.getFormat();
 		String template = """
 				List five {subject}
 				{format}
@@ -123,7 +123,7 @@ void listOutputConverter() {
 		Prompt prompt = new Prompt(promptTemplate.createMessage());
 		Generation generation = this.chatModel.call(prompt).getResult();
 
-		List<String> list = outputParser.convert(generation.getOutput().getContent());
+		List<String> list = converter.convert(generation.getOutput().getContent());
 		assertThat(list).hasSize(5);
 	}
 

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

@@ -103,7 +103,6 @@ void roleTest() {
 		assertThat(response.getResult().getOutput().getContent()).contains("Blackbeard");
 	}
 
-	// @Disabled("TODO: Fix the parser instructions to return the correct format")
 	@Test
 	void listOutputConverter() {
 		DefaultConversionService conversionService = new DefaultConversionService();
@@ -123,7 +122,6 @@ void listOutputConverter() {
 		assertThat(list).hasSize(5);
 	}
 
-	// @Disabled("TODO: Fix the parser instructions to return the correct format")
 	@Test
 	void mapOutputConverter() {
 		MapOutputConverter outputConverter = new MapOutputConverter();
@@ -148,7 +146,7 @@ void mapOutputConverter() {
 	record ActorsFilmsRecord(String actor, List<String> movies) {
 	}
 
-	@Disabled("TODO: Fix the parser instructions to return the correct format")
+	@Disabled("TODO: Fix the converter instructions to return the correct format")
 	@Test
 	void beanOutputConverterRecords() {
 
@@ -169,7 +167,7 @@ void beanOutputConverterRecords() {
 		assertThat(actorsFilms.movies()).hasSize(5);
 	}
 
-	@Disabled("TODO: Fix the parser instructions to return the correct format")
+	@Disabled("TODO: Fix the converter instructions to return the correct format")
 	@Test
 	void beanStreamOutputConverterRecords() {
 

models/spring-ai-moonshot/src/test/java/org/springframework/ai/moonshot/chat/MoonshotChatModelIT.java

@@ -122,7 +122,7 @@ void mapOutputConverter() {
 	}
 
 	@Test
-	void beanOutputParser() {
+	void beanOutputConverter() {
 
 		BeanOutputConverter<ActorsFilms> outputConverter = new BeanOutputConverter<>(ActorsFilms.class);
 
@@ -143,7 +143,7 @@ record ActorsFilmsRecord(String actor, List<String> movies) {
 	}
 
 	@Test
-	void beanOutputParserRecords() {
+	void beanOutputConverterRecords() {
 
 		BeanOutputConverter<ActorsFilmsRecord> outputConverter = new BeanOutputConverter<>(ActorsFilmsRecord.class);
 
@@ -170,7 +170,7 @@ void beanOutputParserRecords() {
 	}
 
 	@Test
-	void beanStreamOutputParserRecords() {
+	void beanStreamOutputConverterRecords() {
 
 		BeanOutputConverter<ActorsFilmsRecord> outputConverter = new BeanOutputConverter<>(ActorsFilmsRecord.class);
 

models/spring-ai-vertex-ai-gemini/src/test/java/org/springframework/ai/vertexai/gemini/VertexAiGeminiChatModelIT.java

@@ -105,9 +105,9 @@ private Prompt createPrompt(VertexAiGeminiChatOptions chatOptions) {
 	@Test
 	void listOutputConverter() {
 		DefaultConversionService conversionService = new DefaultConversionService();
-		ListOutputConverter outputParser = new ListOutputConverter(conversionService);
+		ListOutputConverter converter = new ListOutputConverter(conversionService);
 
-		String format = outputParser.getFormat();
+		String format = converter.getFormat();
 		String template = """
 				List five {subject}
 				{format}
@@ -117,7 +117,7 @@ void listOutputConverter() {
 		Prompt prompt = new Prompt(promptTemplate.createMessage());
 		Generation generation = this.chatModel.call(prompt).getResult();
 
-		List<String> list = outputParser.convert(generation.getOutput().getContent());
+		List<String> list = converter.convert(generation.getOutput().getContent());
 		assertThat(list).hasSize(5);
 	}
 

spring-ai-core/src/main/java/org/springframework/ai/converter/BeanOutputConverter.java

@@ -46,7 +46,7 @@
 
 /**
  * An implementation of {@link StructuredOutputConverter} that transforms the LLM output
- * to a specific object type using JSON schema. This parser works by generating a JSON
+ * to a specific object type using JSON schema. This converter works by generating a JSON
  * schema based on a given Java class or parameterized type reference, which is then used
  * to validate and transform the LLM output into the desired type.
  *