Scripting: fix generateContextDoc path and url elastic#59676

* Add doc runtime class path
* Use getAllHttpSocketURI.get(0) instead of getAllHttpSocketURI to get a single
test cluster URL rather than a list

Backport: 3057e0f

Author: stu-elastic

modules/lang-painless/build.gradle

@@ -97,12 +97,13 @@ testClusters {
 }
 
 task generateContextDoc(type: DefaultTestClustersTask) {
+  dependsOn sourceSets.doc.runtimeClasspath
   useCluster testClusters.generateContextCluster
   doFirst {
     project.javaexec {
       main = 'org.elasticsearch.painless.ContextDocGenerator'
       classpath = sourceSets.doc.runtimeClasspath
-      systemProperty "cluster.uri", "${-> testClusters.generateContextCluster.singleNode().getAllHttpSocketURI()}"
+      systemProperty "cluster.uri", "${-> testClusters.generateContextCluster.singleNode().getAllHttpSocketURI().get(0)}"
     }.assertNormalExitValue()
   }
 }

modules/lang-painless/src/doc/java/org/elasticsearch/painless/ContextDocGenerator.java

@@ -801,7 +801,11 @@ private static boolean isInternalClass(String javaName) {
                 javaName.equals("org.elasticsearch.xpack.sql.expression.function.scalar.geo.GeoShape") ||
                 javaName.equals("org.elasticsearch.xpack.sql.expression.function.scalar.whitelist.InternalSqlScriptUtils") ||
                 javaName.equals("org.elasticsearch.xpack.sql.expression.literal.IntervalDayTime") ||
-                javaName.equals("org.elasticsearch.xpack.sql.expression.literal.IntervalYearMonth");
+                javaName.equals("org.elasticsearch.xpack.sql.expression.literal.IntervalYearMonth") ||
+                javaName.equals("org.elasticsearch.xpack.eql.expression.function.scalar.whitelist.InternalEqlScriptUtils") ||
+                javaName.equals("org.elasticsearch.xpack.ql.expression.function.scalar.InternalQlScriptUtils") ||
+                javaName.equals("org.elasticsearch.xpack.ql.expression.function.scalar.whitelist.InternalQlScriptUtils") ||
+                javaName.equals("org.elasticsearch.script.ScoreScript$ExplanationHolder");
     }
 
     private ContextDocGenerator() {