### Elasticsearch Version

7.17, 8.0

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

n/a

### Problem Description

The TransportDeprecationInfoAction calls DeprecationInfoAction on the current thread, which is a transport_worker thread. Unfortunately if there are a lot of indices this can take tens of seconds. And since it is on the transport_worker thread it can interfere with communication to and from the other machines in the cluster. The result is that this machine (the master) will see that other nodes are not responding, and remove them from the cluster. And other nodes will see that the master is not responding, so they will elect a new master.

### Steps to Reproduce

We have seen this on a cluster with ~5500 indices and ~22,000 fields total. Just running 
```
GET _migration/deprecations
```
will do it.

### Logs (if relevant)

Here is an example thread from our hot_threads log:
```
   100.1% [cpu=100.1%, other=0.0%] (500.4ms out of 500ms) cpu usage by thread 'elasticsearch[es-prod-es-rack1-controller-0][transport_worker][T#7]'
     2/10 snapshots sharing following 120 elements
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:394)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:318)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:394)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:318)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:394)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:318)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readValueUnsafe(AbstractXContentParser.java:394)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readMapEntries(AbstractXContentParser.java:318)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.readMapSafe(AbstractXContentParser.java:304)
       app//org.elasticsearch.xcontent.support.AbstractXContentParser.mapOrdered(AbstractXContentParser.java:259)
       app//org.elasticsearch.common.xcontent.XContentHelper.convertToMap(XContentHelper.java:188)
       app//org.elasticsearch.common.xcontent.XContentHelper.convertToMap(XContentHelper.java:147)
       app//org.elasticsearch.common.xcontent.XContentHelper.convertToMap(XContentHelper.java:106)
       app//org.elasticsearch.cluster.metadata.MappingMetadata.sourceAsMap(MappingMetadata.java:142)
       app//org.elasticsearch.cluster.metadata.MappingMetadata.getSourceAsMap(MappingMetadata.java:154)
       org.elasticsearch.xpack.deprecation.IndexDeprecationChecks.checkGeoShapeMappings(IndexDeprecationChecks.java:729)
       org.elasticsearch.xpack.deprecation.DeprecationChecks.lambda$static$34(DeprecationChecks.java:268)
       org.elasticsearch.xpack.deprecation.DeprecationChecks$$Lambda$1089/0x000000080100d000.apply(Unknown Source)
       org.elasticsearch.xpack.deprecation.DeprecationInfoAction$Response.lambda$from$3(DeprecationInfoAction.java:285)
       org.elasticsearch.xpack.deprecation.DeprecationInfoAction$Response$$Lambda$8943/0x00000008020b1d90.apply(Unknown Source)
       java.base@17.0.2/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
       java.base@17.0.2/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:992)
       java.base@17.0.2/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
       java.base@17.0.2/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
       java.base@17.0.2/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
       java.base@17.0.2/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
       java.base@17.0.2/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
       org.elasticsearch.xpack.deprecation.DeprecationInfoAction.filterChecks(DeprecationInfoAction.java:68)
       org.elasticsearch.xpack.deprecation.DeprecationInfoAction$Response.from(DeprecationInfoAction.java:285)
       org.elasticsearch.xpack.deprecation.TransportDeprecationInfoAction.lambda$masterOperation$1(TransportDeprecationInfoAction.java:130)
       org.elasticsearch.xpack.deprecation.TransportDeprecationInfoAction$$Lambda$8747/0x0000000801ef1468.accept(Unknown Source)
       app//org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:136)
       org.elasticsearch.xpack.deprecation.TransportDeprecationInfoAction.lambda$pluginSettingIssues$4(TransportDeprecationInfoAction.java:160)
       org.elasticsearch.xpack.deprecation.TransportDeprecationInfoAction$$Lambda$8750/0x0000000801ef1b20.accept(Unknown Source)
       app//org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:136)
       app//org.elasticsearch.action.support.GroupedActionListener.onResponse(GroupedActionListener.java:55)
       org.elasticsearch.xpack.deprecation.MlDeprecationChecker.lambda$check$1(MlDeprecationChecker.java:133)
       org.elasticsearch.xpack.deprecation.MlDeprecationChecker$$Lambda$8786/0x0000000801ef3c00.accept(Unknown Source)
       app//org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:136)
       app//org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:31)
       app//org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:88)
       app//org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:82)
       app//org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:31)
       org.elasticsearch.xpack.security.action.filter.SecurityActionFilter.lambda$applyInternal$2(SecurityActionFilter.java:192)
       org.elasticsearch.xpack.security.action.filter.SecurityActionFilter$$Lambda$6585/0x0000000801e1c8d0.accept(Unknown Source)
       app//org.elasticsearch.action.ActionListener$DelegatingFailureActionListener.onResponse(ActionListener.java:219)
       org.elasticsearch.xpack.ml.action.TransportGetModelSnapshotsAction.lambda$getModelSnapshots$2(TransportGetModelSnapshotsAction.java:81)
       org.elasticsearch.xpack.ml.action.TransportGetModelSnapshotsAction$$Lambda$8791/0x000000080204af50.accept(Unknown Source)
       org.elasticsearch.xpack.ml.job.persistence.JobResultsProvider.lambda$modelSnapshots$31(JobResultsProvider.java:1309)
       org.elasticsearch.xpack.ml.job.persistence.JobResultsProvider$$Lambda$8799/0x000000080204ba50.accept(Unknown Source)
       app//org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:136)
       app//org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:31)
       app//org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:88)
       app//org.elasticsearch.action.support.TransportAction$1.onResponse(TransportAction.java:82)
       app//org.elasticsearch.action.support.ContextPreservingActionListener.onResponse(ContextPreservingActionListener.java:31)
       org.elasticsearch.xpack.security.action.filter.SecurityActionFilter.lambda$applyInternal$2(SecurityActionFilter.java:192)
       org.elasticsearch.xpack.security.action.filter.SecurityActionFilter$$Lambda$6585/0x0000000801e1c8d0.accept(Unknown Source)
       app//org.elasticsearch.action.ActionListener$DelegatingFailureActionListener.onResponse(ActionListener.java:219)
       app//org.elasticsearch.action.ActionListener$RunAfterActionListener.onResponse(ActionListener.java:341)
       app//org.elasticsearch.action.search.AbstractSearchAsyncAction.sendSearchResponse(AbstractSearchAsyncAction.java:707)
       app//org.elasticsearch.action.search.ExpandSearchPhase.run(ExpandSearchPhase.java:106)
       app//org.elasticsearch.action.search.AbstractSearchAsyncAction.executePhase(AbstractSearchAsyncAction.java:454)
       app//org.elasticsearch.action.search.AbstractSearchAsyncAction.executeNextPhase(AbstractSearchAsyncAction.java:448)
       app//org.elasticsearch.action.search.FetchSearchPhase.moveToNextPhase(FetchSearchPhase.java:287)
       app//org.elasticsearch.action.search.FetchSearchPhase.lambda$innerRun$1(FetchSearchPhase.java:114)
       app//org.elasticsearch.action.search.FetchSearchPhase$$Lambda$6996/0x0000000801eadd30.run(Unknown Source)
       app//org.elasticsearch.action.search.CountedCollector.countDown(CountedCollector.java:40)
       app//org.elasticsearch.action.search.CountedCollector$$Lambda$8804/0x0000000802099440.run(Unknown Source)
       app//org.elasticsearch.action.search.ArraySearchPhaseResults.consumeResult(ArraySearchPhaseResults.java:35)
       app//org.elasticsearch.action.search.CountedCollector.onResult(CountedCollector.java:48)
       app//org.elasticsearch.action.search.FetchSearchPhase$2.innerOnResponse(FetchSearchPhase.java:226)
       app//org.elasticsearch.action.search.FetchSearchPhase$2.innerOnResponse(FetchSearchPhase.java:220)
       app//org.elasticsearch.action.search.SearchActionListener.onResponse(SearchActionListener.java:33)
       app//org.elasticsearch.action.search.SearchActionListener.onResponse(SearchActionListener.java:18)
       app//org.elasticsearch.action.ActionListenerResponseHandler.handleResponse(ActionListenerResponseHandler.java:43)
       app//org.elasticsearch.action.search.SearchTransportService$ConnectionCountingHandler.handleResponse(SearchTransportService.java:642)
       app//org.elasticsearch.transport.TransportService$4.handleResponse(TransportService.java:847)
       app//org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1471)
       app//org.elasticsearch.transport.InboundHandler.doHandleResponse(InboundHandler.java:340)
       app//org.elasticsearch.transport.InboundHandler.handleResponse(InboundHandler.java:324)
       app//org.elasticsearch.transport.InboundHandler.messageReceived(InboundHandler.java:134)
       app//org.elasticsearch.transport.InboundHandler.inboundMessage(InboundHandler.java:88)
       app//org.elasticsearch.transport.TcpTransport.inboundMessage(TcpTransport.java:743)
       org.elasticsearch.transport.netty4.Netty4MessageChannelHandler$$Lambda$6021/0x0000000801b7e510.accept(Unknown Source)
       app//org.elasticsearch.transport.InboundPipeline.forwardFragments(InboundPipeline.java:147)
       app//org.elasticsearch.transport.InboundPipeline.doHandleBytes(InboundPipeline.java:119)
       app//org.elasticsearch.transport.InboundPipeline.handleBytes(InboundPipeline.java:84)
       org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:71)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:280)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1374)
       io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1237)
       io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1286)
       io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507)
       io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446)
       io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
       io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
       io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
       io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
       io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
       io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
       io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:620)
       io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:583)
       io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
       io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986)
       io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
       java.base@17.0.2/java.lang.Thread.run(Thread.java:833)
```
x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/DeprecationInfoAction.java
&& Objects.equals(nodeSettingsIssues, response.nodeSettingsIssues)
                && Objects.equals(indexSettingsIssues, response.indexSettingsIssues)
                && Objects.equals(pluginSettingsIssues, response.pluginSettingsIssues);
        }
        @Override
        public int hashCode() {
            return Objects.hash(clusterSettingsIssues, nodeSettingsIssues, indexSettingsIssues, pluginSettingsIssues);
        }
        /**
         * This is the function that does the bulk of the logic of taking the appropriate ES dependencies
         * like {@link NodeInfo}, {@link ClusterState}. Alongside these objects and the list of deprecation checks,
         * this function will run through all the checks and build out the final list of issues that exist in the
         * cluster.
         *
         * @param state The cluster state
         * @param indexNameExpressionResolver Used to resolve indices into their concrete names
         * @param request The originating request containing the index expressions to evaluate
         * @param nodeDeprecationResponse The response containing the deprecation issues found on each node
         * @param indexSettingsChecks The list of index-level checks that will be run across all specified
         *                            concrete indices
         * @param clusterSettingsChecks The list of cluster-level checks
         * @return The list of deprecation issues found in the cluster
         */
        public static DeprecationInfoAction.Response from(
            ClusterState state,
            IndexNameExpressionResolver indexNameExpressionResolver,
            Request request,
            NodesDeprecationCheckResponse nodeDeprecationResponse,
            List<Function<IndexMetadata, DeprecationIssue>> indexSettingsChecks,
            List<Function<ClusterState, DeprecationIssue>> clusterSettingsChecks,