[exporter/elasticsearch] Sort and deduplicate attributes for metrics grouping #38083
Description
Component(s)
exporter/elasticsearch
What happened?
Description
ECS and OTel mapping modes implement metrics grouping. They hash the attributes in the order as they are in the attribute maps. However, in the edge case where 2 set of attributes have the same key value pairs but in different orders, they will generate different hash, which will in turn create 2 documents for the same set of dimensions, resulting in version_conflict_engine_exception from TSDB.
OTel mode attributes need to be sorted. ECS mode attributes need to be sorted and deduplicated as attributes at different level are all propagated up to the top level.
Steps to Reproduce
Expected Result
Actual Result
Collector version
v0.120.0
Environment information
Environment
OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")
OpenTelemetry Collector configuration
Log output
Additional context
No response