InfluxDB 1.8.2 OSS - One measurement contains Field values of Another measurement.

__Steps to reproduce:__
List the minimal actions needed to reproduce the behaviour.

1. Created a CSV file which contains the data to be pushed.
2. Using Python Multiprocessing pushing the different measurements at a time.
3. Querying InfluxDB, finding the other measurement field values in another measurement

__Expected behaviour:__
Describe what you expected to happen.
The expected behaviour is, that every measurement should contain only the value that feeds into that measurement.

__Actual behaviour:__
Describe What actually happened.
The actual behaviour is, Field values are mixed in different measurements. Fields in one measurement is also visible in another measurement.

Start by reproducing the report using the CSV input and Python multiprocessing described in the issue against InfluxDB 1.8.2. Confirm whether field values from concurrently written measurements appear in another measurement; the issue is complete when measurement fields remain isolated, with a minimal reproduction or failing test documenting the behavior.

Written by the indexing model from the issue text.