On August 29, 1918, the Council of People's Commissars of the RSFSR issued a decree renouncing the treaties concluded by the Russian Empire with Austria and Prussia, including those concerning the partition of Poland, as contradicting the "principle of self-determination of nations and the revolutionary legal consciousness of the Russian people." Thus, they de facto recognized the independence of Poland and demonstrated to the international community that Russia has no claims to Poland.
The independence of Estonia (its Soviet government) was recognized by the Bolsheviks in December 1918. Russian Bolshevik troops acted here as allies of the Estonian Red Army.
The Cossack governments were never recognized by the Bolsheviks, as were the claims of the Cossacks to be recognized as a separate nationality (which is absolutely logical - the Cossacks are a military estate, a transformed relic of the Middle Ages). Accordingly, there could not have been any Soviet-Cossack wars.
And yes, from the point of view of Soviet and now Russian historiography, all these wars on the territory of the former Russian Empire are considered as a single Civil War, part of which were clashes, including with various nationalists - former Russian citizens. In addition, one should not forget that often large national units and formations were part of the Red Army, and sometimes communist governments were created, claiming the leadership of these regions.
If you look at the situation from, say, Estonia, then you will see only a small fragment of the events taking place around Estonia itself. But if you look at the entire territory of the former Russian Empire, then the events around Estonia are just a small fragment of large-scale events. So yes - there was a Soviet-Estonian war, but this is just one campaign of a big war.
It should also be taken into account that often different factions entered into a military alliance. For example, Polish military formations actively fought against the Bolsheviks in the South of Russia, in the North of Russia and in Siberia. They fought against the Russians, or against one of the factions in the Russian Civil War? Were they participants in the Russian civil war in this case?