La. Stat. tit. 13 § 5127
Upon motion of the plaintiff or the governmental unit the court in which the first proceeding to invalidate or sustain the bonds or the action taken with respect to a new or different source of payment thereof was instituted may enjoin the commencement by any person, corporation or association of any other action or proceeding involving the validity of the bonds or any matter recited in the motion for judgment, and may order a joint hearing before it of all such issues then pending in any actions or proceedings in any court in the state, and may order all such actions or proceedings consolidated with the validation proceeding pending before it, and may make such orders as may be necessary or proper to effect consolidation and as may tend to avoid unnecessary costs or delays. Such order shall not be appealable.
La. R.S. § 13:5127