[1.x][Bug] Remove license concepts in packages/osd-opensearch (#639)

Currenlty, /packages/osd-opensearch/README.md still have license
concepts. This PR cleans the concepts.

Partially Resolved:
#592

Backport PR:
#602

Signed-off-by: Anan Zhuang <ananzh@amazon.com>

packages/osd-opensearch/README.md

@@ -9,9 +9,9 @@ To run, go to the OpenSearch Dashboards root and run `node scripts/opensearch --
 
 ### Examples
 
-Run a snapshot install with a trial license
+Run a snapshot 
 ```
-node scripts/opensearch snapshot --license=trial
+node scripts/opensearch snapshot 
 ```
 
 Run from source with a configured data directory
@@ -26,8 +26,7 @@ Start a cluster
 ```
 var opensearch = require('@osd/opensearch');
 opensearch.run({
-  license: 'basic',
-  version: 7.0,
+  version: 1.0.0,
 })
 .catch(function (e) {
   console.error(e);
@@ -37,12 +36,6 @@ opensearch.run({
 
 #### Options
 
-##### options.license
-
-Type: `String`
-
-License type, one of: trial, basic, gold, platinum
-
 ##### options.version
 
 Type: `String`