NPE when field index turned off with scaled_float type

[tegyud]

Elasticsearch version: 5.2.2
Plugins installed: []
JVM version: openjdk 1.8.0_121
OS version: Ubuntu 16.04

Description of the problem:
Turned off the indexing of one scaled_float field in my mapping and in Kibana the index pattern broke after refreshing the fields.
The result of it in Discover view are these errors: Saved "field" parameter is now invalid. Please select a new field. Discover: "field" is a required parameter.
But the underlying problem is a null pointer exception.

Steps to reproduce:

1. Create an index template mapping with at least one property like this:

"price": {
  "type": "scaled_float",
  "scaling_factor": 100000,
  "index": false
}

• I also set "index.mapper.dynamic" to false in the template settings, but don't think it's required here. I also have a date field.

2. Index a document using the template.
3. Try to refresh the field list of the index pattern in Kibana or create a new one. None of the fields will be selected as searchable or aggregatable.
4. Discover view will instantly show the errors.
5. Check the elasticsearch log for a NPE.

Changing the type to float or double works, and also leaving the index option on default true eliminates the problem, but I really need both index off and scaled_float type.

Logs:

[2017-03-05T01:50:43,410][DEBUG][o.e.a.f.TransportFieldStatsAction] [nody] [algo-2017.03.05][0], node[NyXkT85sSHei6koqdsNq-g], [P], s[STARTED], a[id=yYv-Du-QSDec1-Qs4t1IQA]: failed to execute [org.elasticsearch.action.fieldstats.FieldStatsRequest@6bc02255]
org.elasticsearch.transport.RemoteTransportException: [nody][192.168.0.4:9300][indices:data/read/field_stats[s]]
Caused by: org.elasticsearch.ElasticsearchException: java.util.concurrent.ExecutionException: java.lang.NullPointerException
        at org.elasticsearch.ExceptionsHelper.convertToElastic(ExceptionsHelper.java:55) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.fieldstats.TransportFieldStatsAction.shardOperation(TransportFieldStatsAction.java:202) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.fieldstats.TransportFieldStatsAction.shardOperation(TransportFieldStatsAction.java:55) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.support.broadcast.TransportBroadcastAction$ShardTransportHandler.messageReceived(TransportBroadcastAction.java:301) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.support.broadcast.TransportBroadcastAction$ShardTransportHandler.messageReceived(TransportBroadcastAction.java:297) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:69) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.transport.TransportService$7.doRun(TransportService.java:610) [elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:596) [elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-5.2.2.jar:5.2.2]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_121]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_121]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_121]
Caused by: java.util.concurrent.ExecutionException: java.lang.NullPointerException
        at org.elasticsearch.common.cache.Cache.computeIfAbsent(Cache.java:401) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesRequestCache.getOrCompute(IndicesRequestCache.java:116) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesService.cacheShardLevelResult(IndicesService.java:1195) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesService.getFieldStats(IndicesService.java:1152) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.fieldstats.TransportFieldStatsAction.shardOperation(TransportFieldStatsAction.java:196) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.fieldstats.TransportFieldStatsAction.shardOperation(TransportFieldStatsAction.java:55) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.support.broadcast.TransportBroadcastAction$ShardTransportHandler.messageReceived(TransportBroadcastAction.java:301) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.support.broadcast.TransportBroadcastAction$ShardTransportHandler.messageReceived(TransportBroadcastAction.java:297) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:69) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.transport.TransportService$7.doRun(TransportService.java:610) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:596) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-5.2.2.jar:5.2.2]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_121]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_121]
        at java.lang.Thread.run(Thread.java:745) ~[?:1.8.0_121]
Caused by: java.lang.NullPointerException
        at org.elasticsearch.index.mapper.ScaledFloatFieldMapper$ScaledFloatFieldType.stats(ScaledFloatFieldMapper.java:271) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesService.lambda$getFieldStats$17(IndicesService.java:1154) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesService.lambda$cacheShardLevelResult$18(IndicesService.java:1189) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesRequestCache$Loader.load(IndicesRequestCache.java:160) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesRequestCache$Loader.load(IndicesRequestCache.java:143) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.cache.Cache.computeIfAbsent(Cache.java:398) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesRequestCache.getOrCompute(IndicesRequestCache.java:116) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesService.cacheShardLevelResult(IndicesService.java:1195) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.indices.IndicesService.getFieldStats(IndicesService.java:1152) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.fieldstats.TransportFieldStatsAction.shardOperation(TransportFieldStatsAction.java:196) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.fieldstats.TransportFieldStatsAction.shardOperation(TransportFieldStatsAction.java:55) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.support.broadcast.TransportBroadcastAction$ShardTransportHandler.messageReceived(TransportBroadcastAction.java:301) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.action.support.broadcast.TransportBroadcastAction$ShardTransportHandler.messageReceived(TransportBroadcastAction.java:297) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:69) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.transport.TransportService$7.doRun(TransportService.java:610) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:596) ~[elasticsearch-5.2.2.jar:5.2.2]
        at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-5.2.2.jar:5.2.2]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[?:1.8.0_121]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ~[?:1.8.0_121]
        at java.lang.Thread.run(Thread.java:745) ~[?:1.8.0_121]