The explanation is as follows:
* The transaction command is used to find transactions based on events that meet various constraints12.
* Transactions are made up of the raw text (the _raw field) of each member, the time and date fields of the earliest member, as well as the union of all other fields of each member1.
* The startswith option is used to define the first event in a transaction by specifying a search term or an expression that matches the event13.
* For example, | transaction clientip JSESSIONID startswith="view" will create transactions based on the clientip and JSESSIONID fields, and the first event in each transaction will contain the term "view" in the _raw field2.