Configured a zabbix test loop with history storage in ElasticSearch.
Trends is stored along with the rest of the data in PostgreSQL.
Tables with trends are successfully populated, which can be seen by the number of records.
Today I cleared ElasticSearch from the data (managed to accumulate in 4 days).
Why, then, in the latest data and graphs, the values of trends are not displayed in the absence of history?
Does the zabbix web interface make a selection of trends, or should they be completely abandoned and a very large history should be kept?