Use new indexer version, log errors to elasticsearch.log

GITLAB_ELASTICSEARCH_INDEXER_VERSION

-3.0.1
+3.0.2

doc/integration/advanced_search/elasticsearch.md

@@ -166,7 +166,7 @@ may need to set the `production -> elasticsearch -> indexer_path` setting in you
 ### View indexing errors
 
 Errors from the [GitLab Elasticsearch Indexer](https://gitlab.com/gitlab-org/gitlab-elasticsearch-indexer) are reported in
-the [`sidekiq.log`](../../administration/logs/index.md#sidekiqlog) file with a `json.exception.class` of `Gitlab::Elastic::Indexer::Error`.
+the [`elasticsearch.log`](../../administration/logs/index.md#elasticsearchlog) file and the [`sidekiq.log`](../../administration/logs/index.md#sidekiqlog) file with a `json.exception.class` of `Gitlab::Elastic::Indexer::Error`.
 These errors may occur when indexing Git repository data.
 
 ## Enable Advanced Search

ee/lib/gitlab/elastic/indexer.rb

@@ -103,7 +103,23 @@ def run_indexer!(base_sha, to_sha, target)
 
         output, status = Gitlab::Popen.popen(command, nil, vars)
 
-        raise Error, output unless status&.zero?
+        return unless status.present?
+
+        payload = {
+          message: output,
+          status: status,
+          project_id: project.id,
+          from_sha: base_sha,
+          to_sha: to_sha,
+          index_wiki: index_wiki?
+        }
+
+        if status == 0
+          logger.info(payload)
+        else
+          logger.error(payload)
+          raise Error, output
+        end
       end
 
       # Remove all indexed data for commits and blobs for a project.