ES 2.3.3 to ES 5.5.3


I am new to elasticsearch, I am currently using es 5.5.3. I have previous code which was using ES 2.3.3 and it was doing following

It created .kibana index in ES, after that it is creating .kibana/index-pattern/epls_cache_*

Question1: .kibana/index-pattern/epls_cache_* what is this ? is it index inside another index?

then it tries to post following array

"name": "_index",
"type": "string",
"count": 0,
"scripted": false,
"indexed": false,
"analyzed": false,
"doc_values": false

but I see that I am getting following error:

"error": {
"root_cause": [
"type": "mapper_parsing_exception",
"reason": "failed to parse"
"type": "mapper_parsing_exception",
"reason": "failed to parse",
"caused_by": {
"type": "not_x_content_exception",
"reason": "Compressor detection can only be called on some xcontent bytes or compressed xcontent bytes"
"status": 400

Question2: What am I doing wrong? and how to resolve it


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