Hi @angelo.cataldo ,
In addition to the information that @chavalit-jintamalit provided:
Although I am not a content expert, the field CLOSE in ek.get_timeseries() for government bonds seems to be the yield to maturity. See below the output:
For comparison, below is the output for Yield to Maturity (0.333428) and Close Date (2021-11-29) from Data Item Browser(DIB) which are the same as above.
In general, to look for values which could be potentially used in ek.get_data() or ek.get_timeseries() function you can refer to DIB section in Workspace.