Elasticsearch: reached maximum index count for current plan - status:500 - ruby-on-rails

Question

Is there a Heroku cli command that will allow us to purge Elasticsearch indices?
This is the error that's returned which is causing our application to be non-functional:
reached maximum index count for current plan - status:500
Upgrading our current plan is not a feasible option due to being in stages at this time.
Please advise on how to cure this.

Answer 1

You should be able to simply delete the indices you want via a direct curl call. You first need to retrieve the URL of your ES cluster using the heroku config:get command and retrieving the appropriate variable:
If you've installed the SearchBox addon:
SB_URL=$(heroku config:get SEARCHBOX_URL)
curl -XDELETE http://<SB_URL>/your_index
If you've installed the Found addon:
FOUND_URL=$(heroku config:get FOUNDELASTICSEARCH_URL)
curl -XDELETE http://<FOUND_URL>/your_index
Last but not least if you've installed the Bonsai addon:
BONSAI_URL=$(heroku config:get BONSAI)
curl -XDELETE http://<BONSAI_URL>/your_index
To test this out:
# create one index => OK
> curl -XPOST http://<***_URL>/your_index_1
{"acknowledged":true}
# create second index => OK
> curl -XPOST http://<***_URL>/your_index_2
{"acknowledged":true}
# create n'th index allowed by your plan => NOT OK
> curl -XPOST http://<***_URL>/your_index_n
{"error":"ElasticsearchGenerationException[reached maximum index count for current plan]","status":500}
# delete first index => OK
> curl -XDELETE http://<***_URL>/your_index_1
{"acknowledged":true}
# create n'th index again => OK
> curl -XPOST http://<***_URL>/your_index_n
{"acknowledged":true}

Answer 2

Shortly after posting this, I found a non-cli solution.
log into Heroku
Select the "Resources" tab
Select "SearchBox Elasticsearch" (this is what I have installed, yours may be different)
Select Dashboard > Indices
Select the trash icon next to the index you want to delete