Merge ~rgildein/charm-elasticsearch/+git/charm-elasticsearch-1:bug1983661 into charm-elasticsearch:master

[Robert Gildein]

Remove series from metadata.yaml and drop Xenial

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[Eric Chen (eric-chen)]

review: Approve

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision a87c904c099fb4e8ed3fc6ea730015d8de17b42b

diff --git a/charmcraft.yaml b/charmcraft.yaml
index 021c2c6..2923f5f 100644
--- a/charmcraft.yaml
+++ b/charmcraft.yaml
@@ -26,7 +26,7 @@ parts:
 bases:
     - build-on:
         - name: ubuntu
-          channel: "18.04"
+          channel: "20.04"
           architectures: ["amd64"]
       run-on:
         - name: ubuntu
@@ -37,7 +37,3 @@ bases:
           channel: "18.04"
           architectures:
               - amd64
-        - name: ubuntu
-          channel: "16.04"
-          architectures:
-              - amd64
diff --git a/metadata.yaml b/metadata.yaml
index ea7f532..33c24ea 100644
--- a/metadata.yaml
+++ b/metadata.yaml
@@ -7,9 +7,6 @@ description: |
 tags:
   - misc
 subordinate: false
-series:
-  - focal
-  - bionic
 peers:
   peer:
     interface: http