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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
There are a few open issues on GitHub where people have had problems setting and changing the number of routing shards. This one is probably the closest to the one you found, and it's over three years old: https://github.com/elastic/elasticsearch/issues/33036
NOTE:
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