Merge branch 'feature/slf4jVersionProperty' into 'master'

Create a property for the slf4j version.

See merge request search_discovery/insightengine!144

search-services/alfresco-search/pom.xml

@@ -75,13 +75,13 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>
-            <version>1.7.28</version>
+            <version>${slf4j.version}</version>
         </dependency>
 
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-log4j12</artifactId>
-            <version>1.7.28</version>
+            <version>${slf4j.version}</version>
         </dependency>
 
         <dependency>

search-services/pom.xml

@@ -13,6 +13,9 @@
     <version>1.5.0-SNAPSHOT</version>
     <packaging>pom</packaging>
     <name>Alfresco Solr Search parent</name>
+    <properties>
+        <slf4j.version>1.7.28</slf4j.version>
+    </properties>
     <modules>
         <module>alfresco-solrclient-lib</module>
         <module>alfresco-search</module>