I think there maybemay be a couple of components to this
Israel has excellent defenses and is very strict regarding points of entry into their territory. It's plausible that DAESH has attempted to penetrate and Israel has detained those individuals as high risk, which they do without trial on a regular basis when it comes to Palestinians.
Israel is not waging open warfare on DAESH at the urging of the US State Department it is rumored. The US is concerned that a coalition revolving around a fight with DAESH would be compromised if the coalition included Israel, hence the lack of air strikes from Israel.
DAESH has warned Israel in December of 2015 that they will inject themselves into Palestine and established an Islamic State to include it.