I have a question about Elastic Search

I've used the search api provided by Elastic, I have a question while searching and leave a question.

Why can't I search for "=" or "+" ... etc when searching in Elastic?
If I search for "+abc=", only abc is highlighted.

Among the APIs provided by Elastic, I used BoolQueryBuilder and QueryStringQueryBuilder in java

In addition, I replaced it with "(backslash)=" to search for "=", but to no avail.

Hi
The standard analyzer will remove punctuation in your text.
You can get more info at https://www.elastic.co/guide/en/elasticsearch/guide/current/analysis-intro.html

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