he @Kirt
the main question is - do you search in the message field or do you search in a different field?
The message field is analyzed field that means that the content is split into terms based on the active tokenizer.
Overview:
https://www.elastic.co/guide/en/elasticsearch/reference/6.8/analysis-tokenizers.html
Default Tokenizer
https://www.elastic.co/guide/en/elasticsearch/reference/6.8/analysis-standard-tokenizer.html
As this is based of words (see links above) your dots are not searchable. Because they are no words.
Should the content be in a non analyzed field where the content is simple seen as a string, your search would be possible.