<mat-form-field class="search">
   <mat-label>Suche</mat-label>
   <input matInput type="text" [(ngModel)]="findText" (ngModelChange)="updateParams()" (keydown.esc)="clearFindText()">
      <button mat-button *ngIf="findText" matSuffix mat-icon-button aria-label="Clear" (click)="clearFindText()">
         <mat-icon>close</mat-icon>
      </button>
      <button mat-button matSuffix mat-icon-button title="Volltextsuche" aria-label="Volltextsuche" (click)="openFulltextSearch()">
         <mat-icon>search</mat-icon>
      </button>
</mat-form-field>