Metricbeat Http Module mapping error (Can't merge a non object mapping [http.json_namespace.classes] with an object mapping [http.json_namespace.classes] )

I am running elasticsearch 7.5, kibana 7.5 and Metricbeat 7.5. I have enabled metricbeat's http module to get data from a spring boot app. Here is my metricbeat.yml http module snippet

#--------------------------------- HTTP Module ---------------------------------
- module: http
  metricsets: ["json"]
  period: 60s
  hosts: ["localhost:9998"]
  namespace: "json_namespace"
  path: "/metrics"
  method: "GET"

I get this error when it tries to fetch data from the http module

[2020-01-16T13:28:11,059][DEBUG][o.e.a.b.TransportShardBulkAction] [elasticstage1] [metricbeat-2020.01.16-000001][0] failed to execute bulk item (create) index {[metricbeat][_doc][wQiKrm8BkKjJO7a7Nkwx], source[n/a, actual length: [5.9kb], max length: 2kb]}
java.lang.IllegalArgumentException: Can't merge a non object mapping [http.json_namespace.classes] with an object mapping [http.json_namespace.classes]
	at org.elasticsearch.index.mapper.ObjectMapper.merge(ObjectMapper.java:439) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.ObjectMapper.merge(ObjectMapper.java:47) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.DocumentParser.createDynamicUpdate(DocumentParser.java:237) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.DocumentParser.parseDocument(DocumentParser.java:83) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.DocumentMapper.parse(DocumentMapper.java:267) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.prepareIndex(IndexShard.java:776) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.applyIndexOperation(IndexShard.java:753) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.applyIndexOperationOnPrimary(IndexShard.java:725) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.executeBulkItemRequest(TransportShardBulkAction.java:258) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction$2.doRun(TransportShardBulkAction.java:161) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.performOnPrimary(TransportShardBulkAction.java:193) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:118) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:79) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryShardReference.perform(TransportReplicationAction.java:917) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.ReplicationOperation.execute(ReplicationOperation.java:108) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.runWithPrimaryShardReference(TransportReplicationAction.java:394) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.lambda$doRun$0(TransportReplicationAction.java:316) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.lambda$wrapPrimaryOperationPermitListener$21(IndexShard.java:2752) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.ActionListener$3.onResponse(ActionListener.java:113) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShardOperationPermits.acquire(IndexShardOperationPermits.java:285) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShardOperationPermits.acquire(IndexShardOperationPermits.java:237) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.acquirePrimaryOperationPermit(IndexShard.java:2726) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction.acquirePrimaryOperationPermit(TransportReplicationAction.java:858) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.doRun(TransportReplicationAction.java:312) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction.handlePrimaryRequest(TransportReplicationAction.java:275) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler$1.doRun(SecurityServerTransportInterceptor.java:257) [x-pack-security-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.messageReceived(SecurityServerTransportInterceptor.java:315) [x-pack-security-7.5.0.jar:7.5.0]
	at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:63) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.transport.TransportService$7.doRun(TransportService.java:752) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:773) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-7.5.0.jar:7.5.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_222]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_222]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
[2020-01-16T13:29:11,062][DEBUG][o.e.a.b.TransportShardBulkAction] [elasticstage1] [metricbeat-2020.01.16-000001][0] failed to execute bulk item (create) index {[metricbeat][_doc][9wiLrm8BkKjJO7a7IF6R], source[n/a, actual length: [5.9kb], max length: 2kb]}
java.lang.IllegalArgumentException: mapper [http.json_namespace.classes] of different type, current_type [long], merged_type [ObjectMapper]
	at org.elasticsearch.index.mapper.FieldMapper.doMerge(FieldMapper.java:352) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.NumberFieldMapper.doMerge(NumberFieldMapper.java:1081) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.FieldMapper.merge(FieldMapper.java:339) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.FieldMapper.merge(FieldMapper.java:55) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.DocumentParser.createDynamicUpdate(DocumentParser.java:237) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.DocumentParser.parseDocument(DocumentParser.java:83) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.mapper.DocumentMapper.parse(DocumentMapper.java:267) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.prepareIndex(IndexShard.java:776) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.applyIndexOperation(IndexShard.java:753) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.applyIndexOperationOnPrimary(IndexShard.java:725) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.executeBulkItemRequest(TransportShardBulkAction.java:258) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction$2.doRun(TransportShardBulkAction.java:161) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.performOnPrimary(TransportShardBulkAction.java:193) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:118) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.bulk.TransportShardBulkAction.shardOperationOnPrimary(TransportShardBulkAction.java:79) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$PrimaryShardReference.perform(TransportReplicationAction.java:917) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.ReplicationOperation.execute(ReplicationOperation.java:108) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.runWithPrimaryShardReference(TransportReplicationAction.java:394) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.lambda$doRun$0(TransportReplicationAction.java:316) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:63) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.lambda$wrapPrimaryOperationPermitListener$21(IndexShard.java:2752) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.ActionListener$3.onResponse(ActionListener.java:113) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShardOperationPermits.acquire(IndexShardOperationPermits.java:285) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShardOperationPermits.acquire(IndexShardOperationPermits.java:237) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.index.shard.IndexShard.acquirePrimaryOperationPermit(IndexShard.java:2726) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction.acquirePrimaryOperationPermit(TransportReplicationAction.java:858) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction$AsyncPrimaryAction.doRun(TransportReplicationAction.java:312) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.action.support.replication.TransportReplicationAction.handlePrimaryRequest(TransportReplicationAction.java:275) ~[elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler$1.doRun(SecurityServerTransportInterceptor.java:257) [x-pack-security-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.xpack.security.transport.SecurityServerTransportInterceptor$ProfileSecuredRequestHandler.messageReceived(SecurityServerTransportInterceptor.java:315) [x-pack-security-7.5.0.jar:7.5.0]
	at org.elasticsearch.transport.RequestHandlerRegistry.processMessageReceived(RequestHandlerRegistry.java:63) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.transport.TransportService$7.doRun(TransportService.java:752) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:773) [elasticsearch-7.5.0.jar:7.5.0]
	at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37) [elasticsearch-7.5.0.jar:7.5.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_222]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_222]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]

From the above stacktrace it seems like it tries to create the same fields with a different type. I didnt mess with anything else like fields.yml. Any help?