Add getters for collection and mode in MongoItemWriter

Resolves #3973

Author: santfirax

spring-batch-infrastructure/src/main/java/org/springframework/batch/item/data/MongoItemWriter.java

@@ -121,6 +121,15 @@ public void setMode(final Mode mode) {
 		this.mode = mode;
 	}
 
+	/**
+	 * Get the operating {@link Mode} of the item writer.
+	 * @return the operating mode
+	 * @since 5.1
+	 */
+	public Mode getMode() {
+		return mode;
+	}
+
 	/**
 	 * Set the {@link MongoOperations} to be used to save items to be written.
 	 * @param template the template implementation to be used.
@@ -146,6 +155,15 @@ public void setCollection(String collection) {
 		this.collection = collection;
 	}
 
+	/**
+	 * Get the Mongo collection name.
+	 * @return the collection name
+	 * @since 5.1
+	 */
+	public String getCollection() {
+		return collection;
+	}
+
 	/**
 	 * If a transaction is active, buffer items to be written just before commit.
 	 * Otherwise write items using the provided template.