Fix FILTER_EXPRESSION typo

Author: habuma

spring-ai-core/src/main/java/org/springframework/ai/chat/client/advisor/QuestionAnswerAdvisor.java

@@ -62,7 +62,7 @@ public class QuestionAnswerAdvisor implements RequestResponseAdvisor {
 
 	public static final String RETRIEVED_DOCUMENTS = "qa_retrieved_documents";
 
-	public static final String FILTER_EXRESSION = "qa_filter_expression";
+	public static final String FILTER_EXPRESSION = "qa_filter_expression";
 
 	public QuestionAnswerAdvisor(VectorStore vectorStore) {
 		this(vectorStore, SearchRequest.defaults(), DEFAULT_USER_TEXT_ADVISE);
@@ -141,10 +141,10 @@ public Flux<ChatResponse> adviseResponse(Flux<ChatResponse> fluxResponse, Map<St
 
 	protected Filter.Expression doGetFilterExpression(Map<String, Object> context) {
 
-		if (!context.containsKey(FILTER_EXRESSION) || !StringUtils.hasText(context.get(FILTER_EXRESSION).toString())) {
+		if (!context.containsKey(FILTER_EXPRESSION) || !StringUtils.hasText(context.get(FILTER_EXPRESSION).toString())) {
 			return this.searchRequest.getFilterExpression();
 		}
-		return new FilterExpressionTextParser().parse(context.get(FILTER_EXRESSION).toString());
+		return new FilterExpressionTextParser().parse(context.get(FILTER_EXPRESSION).toString());
 
 	}
 

spring-ai-core/src/test/java/org/springframework/ai/chat/client/QuestionAnswerAdvisorTests.java

@@ -77,7 +77,7 @@ public void qaAdvisorWithDynamicFilterExpressions() {
 		// @formatter:off
 		var content = chatClient.prompt()
 			.user("Please answer my question XYZ")
-			.advisors(a -> a.param(QuestionAnswerAdvisor.FILTER_EXRESSION, "type == 'Spring'"))
+			.advisors(a -> a.param(QuestionAnswerAdvisor.FILTER_EXPRESSION, "type == 'Spring'"))
 			.call()
 			.content();
 		//formatter:on