Stack Management -> Index Management page throws internal server error

[liza-mae]

Kibana version: 7.14.0-SNAPSHOT

Elasticsearch version: 7.14.0-SNAPSHOT

Server OS version: Ubuntu

Browser version: Chrome Latest

Original install method (e.g. download page, yum, from source, etc.):
Snaphots

Description of the problem including expected versus actual behavior:

Steps to reproduce:

1. Navigate to Stack Management -> Index Management -> Indices
2. Observe an internal server error occurs

Errors in browser console (if relevant):
Failed to load resource: the server responded with a status of 500 (Internal Server Error)

Provide logs and/or server output (if relevant):

{"type":"log","@timestamp":"2021-07-01T10:57:18+00:00","tags":["error","http"],"pid":17444,"message":"TypeError: Cannot read
property 'aliases' of undefined\n    at /home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/x-
pack/plugins/index_management/server/lib/fetch_indices.js:46:39\n    at Array.map (<anonymous>)\n    at fetchIndicesCall 
(/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/x-pack/plugins/index_management/server/lib/fetch_indices.js:44:18)\n    
at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:95:5)\n    at fetchIndices 
(/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/x-pack/plugins/index_management/server/lib/fetch_indices.js:66:19)\n    
at /home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/x-
pack/plugins/index_management/server/routes/api/indices/register_list_route.js:29:23\n    at Router.handle 
(/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/src/core/server/http/router/router.js:163:30)\n    at handler 
(/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/src/core/server/http/router/router.js:124:50)\n    at 
exports.Manager.execute (/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-
x86_64/node_modules/@hapi/hapi/lib/toolkit.js:60:28)\n    at Object.internals.handler (/home/vagrant/kibana-7.14.0-SNAPSHOT-
linux-x86_64/node_modules/@hapi/hapi/lib/handler.js:46:20)\n    at exports.execute (/home/vagrant/kibana-7.14.0-SNAPSHOT-
linux-x86_64/node_modules/@hapi/hapi/lib/handler.js:31:20)\n    at Request._lifecycle (/home/vagrant/kibana-7.14.0-
SNAPSHOT-linux-x86_64/node_modules/@hapi/hapi/lib/request.js:370:32)\n    at Request._execute (/home/vagrant/kibana-
7.14.0-SNAPSHOT-linux-x86_64/node_modules/@hapi/hapi/lib/request.js:279:9)"}


{"type":"error","@timestamp":"2021-07-01T10:57:17+00:00","tags":[],"pid":17444,"level":"error", "error":{"message":"Internal 
Server Error","name":"Error","stack":"Error: Internal Server Error\n    at HapiResponseAdapter.toInternalError 
(/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/src/core/server/http/router/response_adapter.js:61:19)\n    at 
Router.handle (/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/src/core/server/http/router/router.js:177:34)\n    at 
runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:95:5)\n    at handler 
(/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-x86_64/src/core/server/http/router/router.js:124:50)\n    at 
exports.Manager.execute (/home/vagrant/kibana-7.14.0-SNAPSHOT-linux-
x86_64/node_modules/@hapi/hapi/lib/toolkit.js:60:28)\n    at Object.internals.handler (/home/vagrant/kibana-7.14.0-SNAPSHOT-
linux-x86_64/node_modules/@hapi/hapi/lib/handler.js:46:20)\n    at exports.execute (/home/vagrant/kibana-7.14.0-SNAPSHOT-
linux-x86_64/node_modules/@hapi/hapi/lib/handler.js:31:20)\n    at Request._lifecycle (/home/vagrant/kibana-7.14.0-
SNAPSHOT-linux-x86_64/node_modules/@hapi/hapi/lib/request.js:370:32)\n    at Request._execute (/home/vagrant/kibana-
7.14.0-SNAPSHOT-linux-x86_64/node_modules/@hapi/hapi/lib/request.js:279:9)"},"url":"https://localhost:5601/api/index_management/indices","message":"Internal Server Error"}

[elasticmachine]

Pinging @elastic/kibana-stack-management (Team:Stack Management)

[alisonelizabeth]

Thanks @liza-mae! This is due to an ES change and related to #103924.

Should be addressed by #104155.