What "index_time_in_millis" means?

I've a cluster with 3 nodes(3 master/2 data). This cluster is monitoring by Zabbix several weeks and now I notice, that metric "index_time_in_millis"(curl -s http://localhost:9200/index_name/_stats?pretty | jq "._all.primaries.indexing.index_time_in_millis") is always growing since i started monitoring. Initially index_time_in_millis show ~55000ms, now it's show ~1818000ms
I thought this metric show average indexing time per document, and this time should have ~ same value. Something wrong with my cluster?

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