Initial implementation of account index in Lucene

This is much simpler than changes, since we don't have so many stored
fields to deal with, and there is no open/closed split.
LuceneAccountIndex is a very straightforward implementation of
AbstractLuceneIndex; there is probably even more that can be factored
out when it comes time to add yet more indexes.

Change-Id: I530003a36152b4330b9e91a7a777eabcf2aeb361

gerrit-server/src/main/java/com/google/gerrit/server/index/DummyIndexModule.java

@@ -14,6 +14,8 @@
 
 package com.google.gerrit.server.index;
 
+import com.google.gerrit.server.account.AccountState;
+import com.google.gerrit.server.index.account.AccountIndex;
 import com.google.gerrit.server.index.change.ChangeIndex;
 import com.google.gerrit.server.index.change.DummyChangeIndex;
 import com.google.gerrit.server.query.change.ChangeData;
@@ -27,11 +29,19 @@ public class DummyIndexModule extends AbstractModule {
     }
   }
 
+  private static class DummyAccountIndexFactory implements AccountIndex.Factory {
+    @Override
+    public AccountIndex create(Schema<AccountState> schema) {
+      throw new UnsupportedOperationException();
+    }
+  }
+
   @Override
   protected void configure() {
     install(new IndexModule(1));
     bind(IndexConfig.class).toInstance(IndexConfig.createDefault());
     bind(Index.class).toInstance(new DummyChangeIndex());
+    bind(AccountIndex.Factory.class).toInstance(new DummyAccountIndexFactory());
     bind(ChangeIndex.Factory.class).toInstance(new DummyChangeIndexFactory());
   }
 }

gerrit-server/src/main/java/com/google/gerrit/server/index/IndexModule.java

@@ -26,6 +26,8 @@ import com.google.common.util.concurrent.MoreExecutors;
 import com.google.gerrit.lifecycle.LifecycleModule;
 import com.google.gerrit.server.config.GerritServerConfig;
 import com.google.gerrit.server.git.WorkQueue;
+import com.google.gerrit.server.index.account.AccountIndexDefinition;
+import com.google.gerrit.server.index.account.AccountSchemaDefinitions;
 import com.google.gerrit.server.index.change.ChangeIndexCollection;
 import com.google.gerrit.server.index.change.ChangeIndexDefinition;
 import com.google.gerrit.server.index.change.ChangeIndexer;
@@ -55,6 +57,7 @@ public class IndexModule extends LifecycleModule {
 
   public static final ImmutableCollection<SchemaDefinitions<?>> ALL_SCHEMA_DEFS =
       ImmutableList.<SchemaDefinitions<?>> of(
+          AccountSchemaDefinitions.INSTANCE,
           ChangeSchemaDefinitions.INSTANCE);
 
   /** Type of secondary index. */
@@ -91,9 +94,12 @@ public class IndexModule extends LifecycleModule {
 
   @Provides
   Collection<IndexDefinition<?, ?, ?>> getIndexDefinitions(
+      AccountIndexDefinition accounts,
       ChangeIndexDefinition changes) {
     Collection<IndexDefinition<?, ?, ?>> result =
-        ImmutableList.<IndexDefinition<?, ?, ?>> of(changes);
+        ImmutableList.<IndexDefinition<?, ?, ?>> of(
+            accounts,
+            changes);
     Set<String> expected = FluentIterable.from(ALL_SCHEMA_DEFS)
         .transform(new Function<SchemaDefinitions<?>, String>() {
           @Override