Ancestry, the genealogy and DNA testing company, has digitized millions of records of people who were displaced or persecuted in the Holocaust and made them searchable online at no cost.

The announcement this week drove numerous genealogists to the site to try to fill in longstanding gaps in family stories. It als o spurred a debate about whether enticing people to sign up for a for-profit database with such sensitive public records was appropriate.

Rachel Silverman, a private genealogist specializing in Jewish family history, said she was enthusiastic about the development, but added that it was too early to know how useful the records would be.

“Every American Jew has people they lost,” she said. “It’s just the matter of the degree of separation.”