add back shield assembly

Original commit: elastic/x-pack-elasticsearch@14c7d7ea8e

shield/pom.xml

@@ -16,6 +16,8 @@
     </parent>
 
     <properties>
+        <!-- TODO: try to avoid this... -->
+        <elasticsearch.assembly.descriptor>${basedir}/src/main/assemblies/plugin.xml</elasticsearch.assembly.descriptor>
         <elasticsearch.plugin.classname>org.elasticsearch.shield.ShieldPlugin</elasticsearch.plugin.classname>
         <!-- TODO: fix plugin dependencies for full isolation -->
         <elasticsearch.plugin.isolated>false</elasticsearch.plugin.isolated>

shield/src/main/assemblies/plugin.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0"?>
+<assembly>
+    <id>plugin</id>
+    <formats>
+        <format>zip</format>
+    </formats>
+    <includeBaseDirectory>false</includeBaseDirectory>
+    <fileSets>
+        <fileSet>
+            <filtered>false</filtered>
+            <directory>bin/shield</directory>
+            <outputDirectory>bin</outputDirectory>
+        </fileSet>
+        <fileSet>
+            <directory>config/shield</directory>
+            <outputDirectory>config</outputDirectory>
+        </fileSet>
+    </fileSets>
+    <dependencySets>
+        <dependencySet>
+            <outputDirectory>/</outputDirectory>
+            <useProjectArtifact>true</useProjectArtifact>
+            <useTransitiveDependencies>false</useTransitiveDependencies>
+            <includes>
+                <include>org.elasticsearch:elasticsearch-shield</include>
+                <include>dk.brics.automaton:automaton</include>
+                <include>com.unboundid:unboundid-ldapsdk</include>
+            </includes>
+        </dependencySet>
+    </dependencySets>
+    <files>
+        <file>
+            <source>LICENSE.txt</source>
+            <outputDirectory>/</outputDirectory>
+        </file>
+        <file>
+            <source>NOTICE.txt</source>
+            <outputDirectory>/</outputDirectory>
+        </file>
+        <file>
+            <source>${elasticsearch.tools.directory}/plugin-metadata/plugin-descriptor.properties</source>
+            <outputDirectory></outputDirectory>
+            <filtered>true</filtered>
+        </file>
+    </files>
+</assembly>