Fix snippet task cc incompatibilities (#101823)

Addresses some Gradle configuration cache issues related to https://github.com/elastic/elasticsearch/issues/57918

build-tools-internal/src/main/groovy/org/elasticsearch/gradle/internal/doc/DocsTestPlugin.groovy

@@ -12,6 +12,7 @@ import org.elasticsearch.gradle.Version
 import org.elasticsearch.gradle.VersionProperties
 import org.elasticsearch.gradle.internal.test.rest.CopyRestApiTask
 import org.elasticsearch.gradle.internal.test.rest.CopyRestTestsTask
+import org.gradle.api.Action
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.file.Directory
@@ -61,16 +62,24 @@ class DocsTestPlugin implements Plugin<Project> {
             group 'Docs'
             description 'List each snippet'
             defaultSubstitutions = commonDefaultSubstitutions
-            perSnippet { println(it.toString()) }
+            perSnippet = new Action<SnippetsTask.Snippet>() {
+                @Override
+                void execute(SnippetsTask.Snippet snippet) {
+                    println(snippet.toString())
+                }
+            }
         }
         project.tasks.register('listConsoleCandidates', SnippetsTask) {
             group 'Docs'
             description
             'List snippets that probably should be marked // CONSOLE'
             defaultSubstitutions = commonDefaultSubstitutions
-            perSnippet {
-                if (RestTestsFromSnippetsTask.isConsoleCandidate(it)) {
-                    println(it.toString())
+            perSnippet = new Action<SnippetsTask.Snippet>() {
+                @Override
+                void execute(SnippetsTask.Snippet snippet) {
+                    if (RestTestsFromSnippetsTask.isConsoleCandidate(it)) {
+                        println(it.toString())
+                    }
                 }
             }
         }
@@ -80,7 +89,7 @@ class DocsTestPlugin implements Plugin<Project> {
             defaultSubstitutions = commonDefaultSubstitutions
             testRoot.convention(restRootDir)
             doFirst {
-                fileOperations.delete(restRootDir)
+                getFileOperations().delete(testRoot.get())
             }
         }
 

build-tools-internal/src/main/groovy/org/elasticsearch/gradle/internal/doc/RestTestsFromSnippetsTask.groovy

@@ -10,8 +10,10 @@ package org.elasticsearch.gradle.internal.doc
 
 import groovy.transform.PackageScope
 import org.elasticsearch.gradle.internal.doc.SnippetsTask.Snippet
+import org.gradle.api.Action
 import org.gradle.api.InvalidUserDataException
 import org.gradle.api.file.DirectoryProperty
+import org.gradle.api.internal.file.FileOperations
 import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.Internal
 import org.gradle.api.tasks.OutputDirectory
@@ -24,7 +26,7 @@ import java.nio.file.Path
 /**
  * Generates REST tests for each snippet marked // TEST.
  */
-class RestTestsFromSnippetsTask extends SnippetsTask {
+abstract class RestTestsFromSnippetsTask extends SnippetsTask {
     /**
      * These languages aren't supported by the syntax highlighter so we
      * shouldn't use them.
@@ -64,13 +66,23 @@ class RestTestsFromSnippetsTask extends SnippetsTask {
     @Internal
     Set<String> names = new HashSet<>()
 
+    @Inject
+    abstract FileOperations getFileOperations();
+
     @Inject
     RestTestsFromSnippetsTask(ObjectFactory objectFactory) {
         testRoot = objectFactory.directoryProperty()
         TestBuilder builder = new TestBuilder()
-        perSnippet builder.&handleSnippet
-        doLast builder.&checkUnconverted
-        doLast builder.&finishLastTest
+        perSnippet = new Action<Snippet>() {
+            @Override
+            void execute(Snippet snippet) {
+                builder.handleSnippet(snippet)
+            }
+        }
+        doLast {
+            builder.checkUnconverted()
+            builder.finishLastTest()
+        }
     }
 
     /**
@@ -190,6 +202,7 @@ class RestTestsFromSnippetsTask extends SnippetsTask {
          * Called each time a snippet is encountered. Tracks the snippets and
          * calls buildTest to actually build the test.
          */
+
         void handleSnippet(Snippet snippet) {
             if (RestTestsFromSnippetsTask.isConsoleCandidate(snippet)) {
                 unconvertedCandidates.add(snippet.path.toString()

build-tools-internal/src/main/groovy/org/elasticsearch/gradle/internal/doc/SnippetsTask.groovy

@@ -11,8 +11,9 @@ package org.elasticsearch.gradle.internal.doc
 import com.fasterxml.jackson.core.JsonFactory;
 import com.fasterxml.jackson.core.JsonParser;
 import com.fasterxml.jackson.core.JsonParseException;
-import com.fasterxml.jackson.core.JsonToken;
+import com.fasterxml.jackson.core.JsonToken
 
+import org.gradle.api.Action;
 import org.gradle.api.DefaultTask
 import org.gradle.api.InvalidUserDataException
 import org.gradle.api.file.ConfigurableFileTree
@@ -44,7 +45,7 @@ class SnippetsTask extends DefaultTask {
      * instance of Snippet.
      */
     @Internal
-    Closure perSnippet
+    Action<Snippet> perSnippet
 
     /**
      * The docs to scan. Defaults to every file in the directory exception the
@@ -134,7 +135,7 @@ class SnippetsTask extends DefaultTask {
                         + "After substitutions and munging, the json looks like:\n" + quoted, e);
                     }
                 }
-                perSnippet(snippet)
+                perSnippet.execute(snippet)
                 snippet = null
             }
             file.eachLine('UTF-8') { String line, int lineNumber ->