Polish contribution

Closes gh-6651

Author: snicoll

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/batch/BatchProperties.java

@@ -73,15 +73,20 @@ public String getTablePrefix() {
 	public class Initializer {
 
 		/**
-		 * Create the required batch tables on startup if necessary.
+		 * Create the required batch tables on startup if necessary. Enabled
+		 * automatically if no custom table prefix is set or if a custom schema is
+		 * configured.
 		 */
-		private boolean enabled = true;
+		private Boolean enabled;
 
 		public boolean isEnabled() {
-			boolean isDefaultTablePrefix = BatchProperties.this.getTablePrefix() == null;
-			boolean isDefaultSchema = DEFAULT_SCHEMA_LOCATION.equals(
+			if (this.enabled != null) {
+				return this.enabled;
+			}
+			boolean defaultTablePrefix = BatchProperties.this.getTablePrefix() == null;
+			boolean customSchema = !DEFAULT_SCHEMA_LOCATION.equals(
 					BatchProperties.this.getSchema());
-			return this.enabled && (isDefaultTablePrefix || !isDefaultSchema);
+			return (defaultTablePrefix || customSchema);
 		}
 
 		public void setEnabled(boolean enabled) {

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -847,7 +847,7 @@ content into your application; rather pick only the properties that you need.
 	spring.artemis.user= # Login user of the broker.
 
 	# SPRING BATCH ({sc-spring-boot-autoconfigure}/batch/BatchProperties.{sc-ext}[BatchProperties])
-	spring.batch.initializer.enabled=true # Create the required batch tables on startup if necessary.
+	spring.batch.initializer.enabled= # Create the required batch tables on startup if necessary. Enabled automatically if no custom table prefix is set or if a custom schema is configured.
 	spring.batch.job.enabled=true # Execute all Spring Batch jobs in the context on startup.
 	spring.batch.job.names= # Comma-separated list of job names to execute on startup (For instance `job1,job2`). By default, all Jobs found in the context are executed.
 	spring.batch.schema=classpath:org/springframework/batch/core/schema-@@platform@@.sql # Path to the SQL file to use to initialize the database schema.