Increasing 'index.mapping.nested_objects.limit' setting's value has no effect

[elastic2 (elastic)]

Hello,

I am facing an issue, where i get the exception:

{
                "type": "mapper_parsing_exception",
                "reason": "The number of nested documents has exceeded the allowed limit of [10000]. This limit can be set by changing the [index.mapping.nested_objects.limit] index level setting."
 }

Even after increasing the limit suffeciently, and verifying that index settings have the changed value, i still get the above exception.

i checked the exception at prompt which executes elasticsearch , and it outputs this:

index {[temp_index][_doc][8K1CgXEBlO2SsOcq_eU6], source[n/a, actual length: [8.9mb], max length: 2kb]}
org.elasticsearch.index.mapper.MapperParsingException: The number of nested documents has exceeded the allowed limit of [10000]. This limit can be set by changing the [index.mapping.nested_objects.limit] index level setting.

It looks the setting does not have any effect?
Also, i think this message : actual length: [8.9mb], max length: 2kb]}
has anything to do with the exception?

Please let me know how do i solve this.
Thanks.