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Yes it will.
Yes indexes are rebulit.
Set indexes=n – Index creation can be postponed until after import completes, by specifying indexes=n. If indexes for the target table already exist at the time of execution, import performs index maintenance when data is inserted into the table. Setting indexes=n eliminates this maintenance overhead. You can also use the indexfile=filename parm to rebuild all the indexes once, after the data is loaded. When editing the indexfile, add the nologging and parallel keywords (where parallel degree = cpu_count-1).