Update starters to route Log4j2 API into SLF4J by default

Closes gh-10847

Author: wilkinsona

spring-boot-project/spring-boot-starters/spring-boot-starter-data-elasticsearch/pom.xml

@@ -27,6 +27,10 @@
 					<groupId>org.slf4j</groupId>
 					<artifactId>jcl-over-slf4j</artifactId>
 				</exclusion>
+				<exclusion>
+					<groupId>org.apache.logging.log4j</groupId>
+					<artifactId>log4j-core</artifactId>
+				</exclusion>
 			</exclusions>
 		</dependency>
 	</dependencies>

spring-boot-project/spring-boot-starters/spring-boot-starter-logging/pom.xml

@@ -18,6 +18,10 @@
 			<groupId>ch.qos.logback</groupId>
 			<artifactId>logback-classic</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.logging.log4j</groupId>
+			<artifactId>log4j-to-slf4j</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>jul-to-slf4j</artifactId>