Is timestamp field also indexed while storing time siries data like logs into an index?

Elastic Stack Elasticsearch
1

Is timestamp field in a logentry of logfile also indexed (ie, made searchable by means of inverted index data structure) while storing time series data like logs into an index/data stream,
provided we are not explicitly mentioning about indexing by means of the dynamic parameter(like dynamic=true/false/runtime)?

In what all other places/data structures a timestamp field in a log is stored, like _source, docvalues, field cache etc.

thanks and regards
shini

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Any field, by default, is indexed and treated the same in Elasticsearch.

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thanks sir

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