Timelion error [illegal_argument_exception] field name is null or empty

Version: 6.3.1
I get this error on clicking the timelion tab:

I have a second es cluster (v 6.3.1 again) where timelion works fine.
Please help

@cobra, it looks like the error is being thrown by cell #4, can you share the timelion query for that cell?

The query is .es(*). In fact, the same error is displayed no matter what query. For simplicity, I have deleted the other cells and only kept cell #1 (and now getting error for that cell). Here's Kibana stdout logs:
{"type":"log","@timestamp":"2018-10-01T18:46:18Z","tags":["timelion","error"],"pid":19737,"message":"Error: in cell #1: [illegal_argument_exception] field name is null or empty: Error: in cell #1: [illegal_argument_exception] field name is null or empty\n at throwWithCell (/root/kibana-6.3.1-linux-x86_64/src/core_plugins/timelion/server/handlers/chain_runner.js:48:11)\n at /root/kibana-6.3.1-linux-x86_64/src/core_plugins/timelion/server/handlers/chain_runner.js:178:13\n at arrayEach (/root/kibana-6.3.1-linux-x86_64/node_modules/lodash/index.js:1289:13)\n at Function.<anonymous> (/root/kibana-6.3.1-linux-x86_64/node_modules/lodash/index.js:3345:13)\n at /root/kibana-6.3.1-linux-x86_64/src/core_plugins/timelion/server/handlers/chain_runner.js:170:24\n at bound (domain.js:301:14)\n at runBound (domain.js:314:12)\n at tryCatcher (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/util.js:26:23)\n at Promise._settlePromiseFromHandler (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/promise.js:503:31)\n at Promise._settlePromiseAt (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/promise.js:577:18)\n at Promise._settlePromises (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/promise.js:693:14)\n at Async._drainQueue (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/async.js:123:16)\n at Async._drainQueues (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/async.js:133:10)\n at Immediate.Async.drainQueues (/root/kibana-6.3.1-linux-x86_64/node_modules/bluebird/js/main/async.js:15:14)\n at runCallback (timers.js:810:20)\n at tryOnImmediate (timers.js:768:5)\n at processImmediate [as _immediateCallback] (timers.js:745:5)"}

If you go to Manamement -> Advanced Settings, what values do you have for timelion:es.timefield and timelion:es.default_index?

Also, can you include the mappings for the value of timelion:es.default_index by running a query in DevTools similar to the following:

GET logstash-*/_mapping
timelion:es.timefield @timestamp
timelion:es.default_index _all

GET _all/_mapping output is huge, hence shared here.

@cobra, can you try changing the timelion:es.default_index to the indices that you're wishing to use timelion with to see if you still get that error?

Tried that with a few individual indices (like s-logstash-2018.10.01 and pf_logs*) but still getting the same error unfortunately.

Got it "resolved" by deleting the .kibana index on elasticsearch. Of course, saved charts and other kibana settings were gone and had to be recreated.

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