TEL AVIV, Israel — Israel’s dramatic weekend rescue of four hostages from the Gaza Strip, in an operation that local health officials say killed 274 Palestinians, came at a sensitive time in the 8-month-old war, as Israel and Hamas weigh a U.S. proposal for a cease-fire and the release of the remaining captives. [time-brightcove not-tgx=”true”] Both sides face renewed pressure to make a deal: The complex rescue is unlikely to be replicated on a scale needed to bring back scores of remaining hostages, and it was a powerful reminder for Israelis that there are still surviving captives held in harsh conditions.