Creates a search filter for matching documents whose specified field value equals the specified value.
The eq() function is chained to a WixSearchFilterBuilder to create a WixSearchFilter.
You can use the filter to match documents where the value of the specified field equals the specified value.
eq() only matches values of the same type. For example, a number value stored
as a String type does not match the same number stored as a Number type.
Matching strings with eq() is case sensitive, so "text" is not equal to "Text".
The field whose value will be compared with value.
The value to match against.