任意实数\(a\)，\(b\)，定义\(a⊕b= \begin{cases} {ab,ab\geqslant 0} \\ { \dfrac {a}{b},ab < 0}\end{cases}\)，设函数\(f(x)=\ln x⊕x\)，正项数列\(\{a _{n} \}\)是公比大于\(0\)的等比数列，且\(a _{1010} =1\)，\(f(a _{1} )+f(a _{2} )+f(a _{3} )+…+f(a _{2019} )+f(a _{2020} )=-e\)，则\(a _{2020} =\)______．