This is the 6856th most frequent Russian word.
абайского
The word "абайского" relates to "Abai," typically referring to something associated with Abai Kunanbayev, a Kazakh poet, or the Abai region in Kazakhstan.
Here, "абайском" refers to the geographical region named after Abai, in a locative context.
Я был в абайском регионе Казахстана.
I visited the Abai region of Kazakhstan.
The word "абайского" is used as a possessive adjective, modifying "национальный герой", meaning it belongs to or is connected with Abai.
Абая - это абайский национальный герой.
Abai is a national hero of Abai.
"Абайскую" modifies "литература," indicating the literature authored by or related to Abai.