NATO countries would be required to intervene on Turkey's behalf if Turkey were to invoke Article 5 of the NATO Charter.
http://www.nato.int/cps/en/natolive/official_texts_17120.htm
"The Parties agree that an armed attack against one or more of them in Europe or North America shall be considered an attack against them all and consequently they agree that, if such an armed attack occurs, each of them, in exercise of the right of individual or collective self-defence recognised by Article 51 of the Charter of the United Nations, will assist the Party or Parties so attacked by taking forthwith, individually and in concert with the other Parties, such action as it deems necessary, including the use of armed force, to restore and maintain the security of the North Atlantic area."
NATO countries are not required to respond (see Kosovo or Iraq war).
Turkey would not be attached (if Turkey forces enter/approach Israel and Israel destroyes them, it is the fault to Turkey. Though, Omaba may take the opportunity and finish Israel once and for all.
Read that section carefully. A response is only triggered if Turkey is attacked on its own soil. If Turkey sends a flotilla into Israeli territorial waters and it's sunk, Turkey is on its own.
An argument could be made that Turkey would be on its own even if it was attacked on its own soil, if that attack was a response to Turkish-initiated aggression.
I don't think the Turkish military is keen on getting into an armed showdown with Israel on Israel's own turf, regardless of what the politicians say.