Remove builds of metrics-reporter-elasticsearch plugin

The elasticsearch-metrics-reporter-java library used by this plugin
is no longer maintained, and the plugin is unlikely to work properly
with modern versions of Elasticsearch.

Bug: Issue 9516
Change-Id: I8553473c6ac2e498e776dc74dda5d190e0f3b05b
diff --git a/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-elasticsearch.yaml b/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-elasticsearch.yaml
deleted file mode 100644
index abd688e..0000000
--- a/jenkins/gerrit-buck-bazel-plugin-metrics-reporter-elasticsearch.yaml
+++ /dev/null
@@ -1,13 +0,0 @@
-- project:
-    name: metrics-reporter-elasticsearch
-    jobs:
-      - 'plugin-{name}-{branch}':
-          branch:
-            - stable-2.13
-      - 'plugin-{name}-bazel-{branch}-{gerrit-branch}':
-          branch:
-            - master
-          gerrit-branch:
-            - master
-            - stable-2.15
-            - stable-2.14