500 error using _render/template

[slylock]

Describe the bug

After upgrading from 2.7 to 2.11, use of the _render/template api returns a 500 error, even though I'm logged in to Dev Tools with a user that has * * permission (all_access role).

Example POST (or GET, either one returns error):
POST _render/template/my_search_template
{
"params": {
"my_param": "hello",...

Error:
{
"error": {
"root_cause": [
{
"type": "security_exception",
"reason": "Unexpected exception indices:data/read/search/template"
}
],
"type": "security_exception",
"reason": "Unexpected exception indices:data/read/search/template"
},
"status": 500
}

Related component

Search

To Reproduce

GET _render/template/my_search_template
{
"params": {
"my_param": "hello",...

Expected behavior

Should return rendered template, but gives 500 error.

Additional Details

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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
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[slylock]

Looks to be a duplicate of #3672

[peternied]

[Triage - attendees 1 2 3 4 5 6 7 8]
@slylock Thanks for creating this issue - that linked item looks to be merged, has this been fixed in a newer version?

[cwperks]

@slylock This is a known issue in 2.11.x.

A fix was released in 2.12.0: #11170