Remove search condition from VectorStoreDocumentRetriever

[aRookieMan]

public final class VectorStoreDocumentRetriever implements DocumentRetriever {

private final VectorStore vectorStore;

private final Double similarityThreshold;

private final Integer topK;

private final Supplier<Filter.Expression> filterExpression;

@Override
public List<Document> retrieve(Query query) {
	Assert.notNull(query, "query cannot be null");
	var searchRequest = SearchRequest.builder()
		.query(query.text())
		.filterExpression(this.filterExpression.get())
		.similarityThreshold(this.similarityThreshold)
		.topK(this.topK)
		.build();
	return this.vectorStore.similaritySearch(searchRequest);
}

}

I think that similarityThreshold\topK\filterExpression should be carried by Query. It can make VectorStoreDocumentRetriever be a singleton Object.