Fix Gradle File leaks (#105597)

Fixing a couple of file leaks (and cleaning up one missing
try-with-resources). The directory descriptor leaks in particular
were leaking massively on every precommit run, to the point where it
slows down the whole system and/or we're running into descriptor limits.

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/VersionPropertiesLoader.java

@@ -21,11 +21,8 @@ import java.util.Properties;
 public class VersionPropertiesLoader {
     static Properties loadBuildSrcVersion(File input, ProviderFactory providerFactory) throws IOException {
         Properties props = new Properties();
-        InputStream is = new FileInputStream(input);
-        try {
+        try (InputStream is = new FileInputStream(input)) {
             props.load(is);
-        } finally {
-            is.close();
         }
         loadBuildSrcVersion(props, providerFactory);
         return props;

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/test/rest/CopyRestApiTask.java

@@ -146,13 +146,16 @@ public class CopyRestApiTask extends DefaultTask {
         try {
             // check source folder for tests
             if (sourceResourceDir != null && new File(sourceResourceDir, REST_TEST_PREFIX).exists()) {
-                return Files.walk(sourceResourceDir.toPath().resolve(REST_TEST_PREFIX))
-                    .anyMatch(p -> p.getFileName().toString().endsWith("yml"));
+                try (var files = Files.walk(sourceResourceDir.toPath().resolve(REST_TEST_PREFIX))) {
+                    return files.anyMatch(p -> p.getFileName().toString().endsWith("yml"));
+                }
             }
             // check output for cases where tests are copied programmatically
             File yamlTestOutputDir = new File(additionalYamlTestsDir.get().getAsFile(), REST_TEST_PREFIX);
             if (yamlTestOutputDir.exists()) {
-                return Files.walk(yamlTestOutputDir.toPath()).anyMatch(p -> p.getFileName().toString().endsWith("yml"));
+                try (var files = Files.walk(yamlTestOutputDir.toPath())) {
+                    return files.anyMatch(p -> p.getFileName().toString().endsWith("yml"));
+                }
             }
         } catch (IOException e) {
             throw new IllegalStateException(String.format("Error determining if this project [%s] has rest tests.", getProject()), e);

build-tools/src/main/java/org/elasticsearch/gradle/LoggedExec.java

@@ -118,7 +118,9 @@ public abstract class LoggedExec extends DefaultTask implements FileSystemOperat
                 try {
                     // the file may not exist if the command never output anything
                     if (Files.exists(spoolFile.toPath())) {
-                        Files.lines(spoolFile.toPath()).forEach(logger::error);
+                        try (var lines = Files.lines(spoolFile.toPath())) {
+                            lines.forEach(logger::error);
+                        }
                     }
                 } catch (IOException e) {
                     throw new RuntimeException("could not log", e);

build-tools/src/main/java/org/elasticsearch/gradle/testclusters/ElasticsearchNode.java

@@ -458,7 +458,9 @@ public class ElasticsearchNode implements TestClusterConfiguration {
                 // make sure we always start fresh
                 if (Files.exists(workingDir)) {
                     if (preserveDataDir) {
-                        Files.list(workingDir).filter(path -> path.equals(confPathData) == false).forEach(this::uncheckedDeleteWithRetry);
+                        try (var files = Files.list(workingDir)) {
+                            files.filter(path -> path.equals(confPathData) == false).forEach(this::uncheckedDeleteWithRetry);
+                        }
                     } else {
                         deleteWithRetry(workingDir);
                     }