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diff --git a/java/com/google/gerrit/elasticsearch/ElasticAccountIndex.java b/java/com/google/gerrit/elasticsearch/ElasticAccountIndex.java
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+// Copyright (C) 2016 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.elasticsearch;
+
+import static com.google.gerrit.server.index.account.AccountField.ID;
+
+import com.google.gerrit.elasticsearch.ElasticMapping.MappingProperties;
+import com.google.gerrit.elasticsearch.bulk.BulkRequest;
+import com.google.gerrit.elasticsearch.bulk.IndexRequest;
+import com.google.gerrit.elasticsearch.bulk.UpdateRequest;
+import com.google.gerrit.index.QueryOptions;
+import com.google.gerrit.index.Schema;
+import com.google.gerrit.index.query.DataSource;
+import com.google.gerrit.index.query.Predicate;
+import com.google.gerrit.index.query.QueryParseException;
+import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.server.account.AccountCache;
+import com.google.gerrit.server.account.AccountState;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.index.IndexUtils;
+import com.google.gerrit.server.index.account.AccountField;
+import com.google.gerrit.server.index.account.AccountIndex;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.inject.Inject;
+import com.google.inject.Provider;
+import com.google.inject.assistedinject.Assisted;
+import java.io.IOException;
+import java.util.Set;
+import org.apache.http.HttpStatus;
+import org.elasticsearch.client.Response;
+
+public class ElasticAccountIndex extends AbstractElasticIndex<Account.Id, AccountState>
+    implements AccountIndex {
+  static class AccountMapping {
+    final MappingProperties accounts;
+
+    AccountMapping(Schema<AccountState> schema, ElasticQueryAdapter adapter) {
+      this.accounts = ElasticMapping.createMapping(schema, adapter);
+    }
+  }
+
+  private static final String ACCOUNTS = "accounts";
+
+  private final AccountMapping mapping;
+  private final Provider<AccountCache> accountCache;
+  private final Schema<AccountState> schema;
+
+  @Inject
+  ElasticAccountIndex(
+      ElasticConfiguration cfg,
+      SitePaths sitePaths,
+      Provider<AccountCache> accountCache,
+      ElasticRestClientProvider client,
+      @Assisted Schema<AccountState> schema) {
+    super(cfg, sitePaths, schema, client, ACCOUNTS);
+    this.accountCache = accountCache;
+    this.mapping = new AccountMapping(schema, client.adapter());
+    this.schema = schema;
+  }
+
+  @Override
+  public void replace(AccountState as) throws IOException {
+    BulkRequest bulk =
+        new IndexRequest(getId(as), indexName, type, client.adapter())
+            .add(new UpdateRequest<>(schema, as));
+
+    String uri = getURI(type, BULK);
+    Response response = postRequest(uri, bulk, getRefreshParam());
+    int statusCode = response.getStatusLine().getStatusCode();
+    if (statusCode != HttpStatus.SC_OK) {
+      throw new IOException(
+          String.format(
+              "Failed to replace account %s in index %s: %s",
+              as.getAccount().getId(), indexName, statusCode));
+    }
+  }
+
+  @Override
+  public DataSource<AccountState> getSource(Predicate<AccountState> p, QueryOptions opts)
+      throws QueryParseException {
+    JsonArray sortArray = getSortArray(AccountField.ID.getName());
+    return new ElasticQuerySource(p, opts.filterFields(IndexUtils::accountFields), type, sortArray);
+  }
+
+  @Override
+  protected String getDeleteActions(Account.Id a) {
+    return delete(type, a);
+  }
+
+  @Override
+  protected String getMappings() {
+    return getMappingsForSingleType(ACCOUNTS, mapping.accounts);
+  }
+
+  @Override
+  protected String getId(AccountState as) {
+    return as.getAccount().getId().toString();
+  }
+
+  @Override
+  protected AccountState fromDocument(JsonObject json, Set<String> fields) {
+    JsonElement source = json.get("_source");
+    if (source == null) {
+      source = json.getAsJsonObject().get("fields");
+    }
+
+    Account.Id id = new Account.Id(source.getAsJsonObject().get(ID.getName()).getAsInt());
+    // Use the AccountCache rather than depending on any stored fields in the document (of which
+    // there shouldn't be any). The most expensive part to compute anyway is the effective group
+    // IDs, and we don't have a good way to reindex when those change.
+    // If the account doesn't exist return an empty AccountState to represent the missing account
+    // to account the fact that the account exists in the index.
+    return accountCache.get().getEvenIfMissing(id);
+  }
+}