Of course Israel welcomes this report. Israel created this report and gaver it to the Bulgarian government. There was no need to investigate who done it. It was already predecided by Israel and Bulgaria. However, branding the Hezbollah as a terrorist organization means nothing. The Lebanese people are the ones who will decide what Hezbollah is and by recent events, the Lebanese people regard Hezbollah as a political movement, not a terrorist movement and they do not care what America and Israel or the rest of the world regards Hezbollah as.
Monitor: Airstrikes hit Islamic State stronghold in Syria, killing at least 13 (Reuters)
from the article: Israel welcomes Bulgarian report linking Hezbollah to Burgas bombing