DynamicFromField return a `function` with based on given str if str consist xxx{{field}}xxx, the `function` will replace `field` with doc[field] otherwise, the `function` simply return s.

IsSoFile check if a given name has .so in the end.

SigControl provides a block over SIGTERM(Ctrl-C) and SIGINT which provides a graceful shutdown control when pod is killed.

YamlConvert try to convert contentMapStr to target with yaml (un)marshal.