"growing indignation" is correct and usable in written English.
You can use it when you are describing a situation where someone is becoming more and more angry or frustrated. For example: "The mayor's lack of response to the citizens' concerns was met with growing indignation."
What brought it to the Germans' attention was the publicity given to growing indignation about German paintings still in Russian hands.
Fernández, currently on a state visit to China, is facing growing indignation at home over Nisman's death, and her response to the brewing political crisis.
The political crisis may for now have been averted, but this has not stopped growing indignation fuelled by socio-economic grievances.
For many American troops passing through Leipzig to the war zones, the steep cost of a quick call home from pay phones has been a source of growing indignation.
In 1876, William Ewart Gladstone, the Liberal magus then in semi-retirement, took up the horrors of the Ottomans' brutal repression of Bulgarian nationalists; four years later, his growing indignation helped bring down the Disraeli government.
The manner in which the gringos treat the American continent (remember that the gringos are Yankees) aroused my growing indignation, but at the same time I studied the theoretical explanation for what they do and found that it was scientific.
When the middlemen grew indignant, demanding to know why this nearly identical type of ware cost more, he counseled the women to respond with a whiff of their own indignation, "Because it is an armadillo and not a pig".
The result is a growing tide of indignation that threatens to tarnish the reputations of some companies and put others in legal predicaments, labor lawyers say.
His declarations that the United States will act unilaterally on issues like developing a missile defense has stirred a growing sense of indignation here.
It advises customers against asking for credit, because "a refusal often offends".In much of the world, and even among some Americans, indignation is growing at George Bush's slow but remorseless preparations to remove Saddam Hussein, Iraq's president, by military force (see article).
After a week in which the government struggled to find a candidate the congress would accept, the appointment of constitutional judge Alejandro Maldonado seems unlikely to stall the growing wave of public indignation that helped force Roxana Baldetti out of office.
