Failed to execute bulk item in ES

Elastic Stack Elasticsearch
1

Hello,

Can someone explain what does it mean?
We're using ES 5.6 and in ES logs I see a bunch of records like:

[2018-08-10T15:59:14,212][DEBUG][o.e.a.b.TransportShardBulkAction] [data-001] [logstash-2018.08.10][0] failed to execute bulk item (index) BulkShardRequest [[logstash-2018.08.10][0]] containing [188] requests
org.elasticsearch.index.mapper.MapperParsingException: failed to parse [xyz_params]

OR

[2018-08-10T15:59:26,187][DEBUG][o.e.a.b.TransportShardBulkAction] [data-001] [logstash-2018.08.10][0] failed to execute bulk item (index) BulkShardRequest [[logstash-2018.08.10][0]] containing [204] requests
org.elasticsearch.index.mapper.MapperParsingException: object mapping for [xyz_request] tried to parse field [null] as object, but found a concrete value

2

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