Remove all unused imports and fix CRLF (#31207)

The X-Pack opening and the recent other refactorings left a lot of 
unused imports in the codebase. This commit removes them all.

client/benchmark/src/main/java/org/elasticsearch/client/benchmark/AbstractBenchmark.java

@@ -28,8 +28,6 @@
 import java.lang.management.GarbageCollectorMXBean;
 import java.lang.management.ManagementFactory;
 import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 

client/rest-high-level/src/test/java/org/elasticsearch/client/RequestConvertersTests.java

@@ -30,7 +30,6 @@
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.DocWriteRequest;
 import org.elasticsearch.action.admin.cluster.node.tasks.cancel.CancelTasksRequest;
-import org.elasticsearch.action.admin.cluster.node.tasks.cancel.CancelTasksResponse;
 import org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksRequest;
 import org.elasticsearch.action.admin.cluster.repositories.delete.DeleteRepositoryRequest;
 import org.elasticsearch.action.admin.cluster.repositories.get.GetRepositoriesRequest;
@@ -99,7 +98,6 @@
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.common.xcontent.XContentType;
-import org.elasticsearch.common.xcontent.json.JsonXContent;
 import org.elasticsearch.index.RandomCreateIndexGenerator;
 import org.elasticsearch.index.VersionType;
 import org.elasticsearch.index.query.TermQueryBuilder;

client/rest-high-level/src/test/java/org/elasticsearch/client/SnapshotIT.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.client;
 
-import org.apache.http.entity.ContentType;
-import org.apache.http.entity.StringEntity;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.action.admin.cluster.repositories.delete.DeleteRepositoryRequest;
 import org.elasticsearch.action.admin.cluster.repositories.delete.DeleteRepositoryResponse;
@@ -35,7 +33,6 @@
 import org.elasticsearch.rest.RestStatus;
 
 import java.io.IOException;
-import java.util.Collections;
 
 import static org.hamcrest.Matchers.equalTo;
 

client/rest/src/test/java/org/elasticsearch/client/RequestTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.client;
 
-import org.apache.http.Header;
 import org.apache.http.HttpEntity;
 import org.apache.http.entity.ByteArrayEntity;
 import org.apache.http.entity.ContentType;
@@ -29,9 +28,7 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
-import java.util.ArrayList;
 import java.util.HashMap;
-import java.util.List;
 import java.util.Map;
 
 import static org.junit.Assert.assertEquals;

distribution/archives/integ-test-zip/src/test/java/org/elasticsearch/test/rest/CreatedLocationHeaderIT.java

@@ -23,7 +23,6 @@
 import org.apache.http.entity.StringEntity;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.Response;
-import org.junit.Before;
 
 import java.io.IOException;
 

distribution/tools/plugin-cli/src/main/java/org/elasticsearch/plugins/ListPluginsCommand.java

@@ -23,19 +23,15 @@
 import org.elasticsearch.Version;
 import org.elasticsearch.cli.EnvironmentAwareCommand;
 import org.elasticsearch.cli.Terminal;
-import org.elasticsearch.common.Nullable;
 import org.elasticsearch.env.Environment;
 
 import java.io.IOException;
 import java.nio.file.DirectoryStream;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
-import java.util.Set;
-import java.util.stream.Collectors;
 
 /**
  * A command for the plugin cli to list plugins installed in elasticsearch.

distribution/tools/plugin-cli/src/main/java/org/elasticsearch/plugins/PluginCli.java

@@ -22,7 +22,6 @@
 import org.elasticsearch.core.internal.io.IOUtils;
 import org.elasticsearch.cli.Command;
 import org.elasticsearch.cli.LoggingAwareMultiCommand;
-import org.elasticsearch.cli.MultiCommand;
 import org.elasticsearch.cli.Terminal;
 
 import java.io.IOException;

distribution/tools/plugin-cli/src/test/java/org/elasticsearch/plugins/RemovePluginCommandTests.java

@@ -23,7 +23,6 @@
 import org.elasticsearch.Version;
 import org.elasticsearch.cli.ExitCodes;
 import org.elasticsearch.cli.MockTerminal;
-import org.elasticsearch.cli.Terminal;
 import org.elasticsearch.cli.UserException;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.env.Environment;

libs/core/src/main/java/org/elasticsearch/common/unit/TimeValue.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.common.unit;
 
-import java.io.IOException;
 import java.util.Locale;
 import java.util.Objects;
 import java.util.concurrent.TimeUnit;

libs/grok/src/test/java/org/elasticsearch/grok/GrokTests.java

@@ -22,7 +22,6 @@
 import org.elasticsearch.test.ESTestCase;
 import org.junit.Before;
 
-import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashMap;

libs/nio/src/main/java/org/elasticsearch/nio/NioChannel.java

@@ -22,7 +22,6 @@
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.nio.channels.NetworkChannel;
-import java.nio.channels.SocketChannel;
 import java.util.function.BiConsumer;
 
 /**

libs/x-content/src/test/java/org/elasticsearch/common/xcontent/XContentParserTests.java

@@ -20,7 +20,6 @@
 package org.elasticsearch.common.xcontent;
 
 import com.fasterxml.jackson.core.JsonParseException;
-import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.xcontent.json.JsonXContent;

modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/SnowballAnalyzer.java

@@ -30,7 +30,6 @@
 import org.apache.lucene.analysis.standard.StandardFilter;
 import org.apache.lucene.analysis.standard.StandardTokenizer;
 import org.apache.lucene.analysis.tr.TurkishLowerCaseFilter;
-import org.apache.lucene.util.Version;
 
 /** Filters {@link StandardTokenizer} with {@link StandardFilter}, {@link
  * LowerCaseFilter}, {@link StopFilter} and {@link SnowballFilter}.

modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/StandardHtmlStripAnalyzerProvider.java

@@ -20,8 +20,6 @@
 package org.elasticsearch.analysis.common;
 
 import org.apache.lucene.analysis.CharArraySet;
-import org.apache.lucene.analysis.core.StopAnalyzer;
-import org.elasticsearch.Version;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.index.IndexSettings;

modules/analysis-common/src/main/java/org/elasticsearch/analysis/common/StemmerTokenFilterFactory.java

@@ -76,7 +76,6 @@
 import org.tartarus.snowball.ext.LithuanianStemmer;
 import org.tartarus.snowball.ext.LovinsStemmer;
 import org.tartarus.snowball.ext.NorwegianStemmer;
-import org.tartarus.snowball.ext.PorterStemmer;
 import org.tartarus.snowball.ext.PortugueseStemmer;
 import org.tartarus.snowball.ext.RomanianStemmer;
 import org.tartarus.snowball.ext.RussianStemmer;

modules/analysis-common/src/test/java/org/elasticsearch/analysis/common/ShingleTokenFilterTests.java

@@ -23,31 +23,14 @@
 import org.apache.lucene.analysis.Tokenizer;
 import org.apache.lucene.analysis.core.WhitespaceTokenizer;
 import org.apache.lucene.analysis.miscellaneous.DisableGraphAttribute;
-import org.elasticsearch.Version;
-import org.elasticsearch.action.search.SearchResponse;
-import org.elasticsearch.cluster.metadata.IndexMetaData;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.env.Environment;
-import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.analysis.AnalysisTestsHelper;
-import org.elasticsearch.index.analysis.IndexAnalyzers;
-import org.elasticsearch.index.analysis.NamedAnalyzer;
 import org.elasticsearch.index.analysis.TokenFilterFactory;
-import org.elasticsearch.index.query.Operator;
-import org.elasticsearch.plugins.Plugin;
-import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.test.ESTokenStreamTestCase;
-import org.elasticsearch.test.IndexSettingsModule;
 
 import java.io.StringReader;
-import java.util.Arrays;
-import java.util.Collection;
-
-import static org.elasticsearch.index.query.QueryBuilders.queryStringQuery;
-import static org.elasticsearch.test.ESTestCase.createTestAnalysis;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
-import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
 
 public class ShingleTokenFilterTests extends ESTokenStreamTestCase {
     public void testPreConfiguredShingleFilterDisableGraphAttribute() throws Exception {

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/DateIndexNameProcessor.java

@@ -25,7 +25,6 @@
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
-import java.util.Objects;
 import java.util.function.Function;
 
 import org.elasticsearch.ExceptionsHelper;

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/JsonProcessor.java

@@ -19,19 +19,12 @@
 
 package org.elasticsearch.ingest.common;
 
-import com.fasterxml.jackson.core.JsonParseException;
-import org.apache.lucene.util.BytesRef;
-import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.common.bytes.BytesArray;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.xcontent.DeprecationHandler;
 import org.elasticsearch.common.xcontent.NamedXContentRegistry;
-import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.common.xcontent.XContentParser;
-import org.elasticsearch.common.xcontent.XContentParserUtils;
-import org.elasticsearch.common.xcontent.XContentType;
 import org.elasticsearch.common.xcontent.json.JsonXContent;
-import org.elasticsearch.common.xcontent.json.JsonXContentParser;
 import org.elasticsearch.ingest.AbstractProcessor;
 import org.elasticsearch.ingest.ConfigurationUtils;
 import org.elasticsearch.ingest.IngestDocument;

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/KeyValueProcessor.java

@@ -27,7 +27,6 @@
 
 import java.util.Arrays;
 import java.util.Collections;
-import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/URLDecodeProcessor.java

@@ -21,8 +21,6 @@
 
 import java.io.UnsupportedEncodingException;
 import java.net.URLDecoder;
-import java.nio.charset.StandardCharsets;
-import java.util.Locale;
 import java.util.Map;
 
 /**

modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/AppendProcessorFactoryTests.java

@@ -22,7 +22,6 @@
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.ingest.TestTemplateService;
-import org.elasticsearch.script.ScriptService;
 import org.elasticsearch.test.ESTestCase;
 import org.junit.Before;
 
@@ -32,7 +31,6 @@
 import java.util.Map;
 
 import static org.hamcrest.CoreMatchers.equalTo;
-import static org.mockito.Mockito.mock;
 
 public class AppendProcessorFactoryTests extends ESTestCase {
 

modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/AppendProcessorTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.ingest.common;
 
-import org.elasticsearch.index.VersionType;
 import org.elasticsearch.ingest.IngestDocument;
 import org.elasticsearch.ingest.IngestDocument.MetaData;
 import org.elasticsearch.ingest.Processor;

modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/IngestRestartIT.java

@@ -19,9 +19,7 @@
 package org.elasticsearch.ingest.common;
 
 import org.elasticsearch.ElasticsearchException;
-import org.elasticsearch.ExceptionsHelper;
 import org.elasticsearch.action.support.WriteRequest;
-import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.bytes.BytesArray;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.settings.Settings;

modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/JoinProcessorFactoryTests.java

@@ -20,7 +20,6 @@
 package org.elasticsearch.ingest.common;
 
 import org.elasticsearch.ElasticsearchParseException;
-import org.elasticsearch.ingest.RandomDocumentPicks;
 import org.elasticsearch.test.ESTestCase;
 
 import java.util.HashMap;

modules/ingest-common/src/test/java/org/elasticsearch/ingest/common/SetProcessorTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.ingest.common;
 
-import org.elasticsearch.index.VersionType;
 import org.elasticsearch.ingest.IngestDocument;
 import org.elasticsearch.ingest.IngestDocument.MetaData;
 import org.elasticsearch.ingest.Processor;

modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/RestMultiSearchTemplateAction.java

@@ -19,8 +19,6 @@
 
 package org.elasticsearch.script.mustache;
 
-import org.elasticsearch.ElasticsearchException;
-import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.client.node.NodeClient;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.rest.BaseRestHandler;

modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/RestSearchTemplateAction.java

@@ -21,20 +21,13 @@
 
 import org.elasticsearch.action.search.SearchRequest;
 import org.elasticsearch.client.node.NodeClient;
-import org.elasticsearch.common.ParseField;
-import org.elasticsearch.common.ParsingException;
-import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.xcontent.ObjectParser;
-import org.elasticsearch.common.xcontent.XContentBuilder;
-import org.elasticsearch.common.xcontent.XContentFactory;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestController;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.action.RestStatusToXContentListener;
 import org.elasticsearch.rest.action.search.RestSearchAction;
-import org.elasticsearch.script.ScriptType;
 
 import java.io.IOException;
 import java.util.Collections;

modules/lang-mustache/src/test/java/org/elasticsearch/script/mustache/CustomMustacheFactoryTests.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.script.mustache;
 
-import org.elasticsearch.script.ExecutableScript;
 import org.elasticsearch.script.Script;
 import org.elasticsearch.script.ScriptEngine;
 import org.elasticsearch.script.TemplateScript;

modules/lang-painless/src/main/java/org/elasticsearch/painless/Definition.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.painless;
 
-import org.apache.lucene.util.SetOnce;
 import org.elasticsearch.painless.spi.Whitelist;
 
 import java.lang.invoke.MethodHandle;

modules/lang-painless/src/main/java/org/elasticsearch/painless/ScriptClassInfo.java

@@ -23,9 +23,7 @@
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
 import java.util.ArrayList;
-import java.util.LinkedHashSet;
 import java.util.List;
-import java.util.Set;
 import java.util.function.Function;
 
 import static java.util.Collections.unmodifiableList;

modules/lang-painless/src/main/java/org/elasticsearch/painless/SimpleChecksAdapter.java

@@ -22,7 +22,6 @@
 import org.objectweb.asm.ClassVisitor;
 import org.objectweb.asm.Label;
 import org.objectweb.asm.MethodVisitor;
-import org.objectweb.asm.Opcodes;
 import org.objectweb.asm.util.CheckClassAdapter;
 import org.objectweb.asm.util.CheckMethodAdapter;
 

modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr/EnhancedPainlessLexer.java

@@ -20,12 +20,9 @@
 package org.elasticsearch.painless.antlr;
 
 import org.antlr.v4.runtime.CharStream;
-import org.antlr.v4.runtime.Lexer;
 import org.antlr.v4.runtime.LexerNoViableAltException;
 import org.antlr.v4.runtime.Token;
-import org.antlr.v4.runtime.TokenSource;
 import org.antlr.v4.runtime.misc.Interval;
-import org.antlr.v4.runtime.misc.Pair;
 import org.elasticsearch.painless.Definition;
 import org.elasticsearch.painless.Location;
 

modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr/PainlessLexer.java

@@ -2,12 +2,9 @@
 package org.elasticsearch.painless.antlr;
 import org.antlr.v4.runtime.Lexer;
 import org.antlr.v4.runtime.CharStream;
-import org.antlr.v4.runtime.Token;
-import org.antlr.v4.runtime.TokenStream;
 import org.antlr.v4.runtime.*;
 import org.antlr.v4.runtime.atn.*;
 import org.antlr.v4.runtime.dfa.DFA;
-import org.antlr.v4.runtime.misc.*;
 
 @SuppressWarnings({"all", "warnings", "unchecked", "unused", "cast"})
 abstract class PainlessLexer extends Lexer {

modules/lang-painless/src/main/java/org/elasticsearch/painless/antlr/PainlessParser.java

@@ -3,11 +3,8 @@
 import org.antlr.v4.runtime.atn.*;
 import org.antlr.v4.runtime.dfa.DFA;
 import org.antlr.v4.runtime.*;
-import org.antlr.v4.runtime.misc.*;
 import org.antlr.v4.runtime.tree.*;
 import java.util.List;
-import java.util.Iterator;
-import java.util.ArrayList;
 
 @SuppressWarnings({"all", "warnings", "unchecked", "unused", "cast"})
 class PainlessParser extends Parser {

modules/lang-painless/src/main/java/org/elasticsearch/painless/node/ECallLocal.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.painless.node;
 
-import org.elasticsearch.painless.Definition;
 import org.elasticsearch.painless.Definition.Method;
 import org.elasticsearch.painless.Definition.MethodKey;
 import org.elasticsearch.painless.Globals;