China has been less aggressive with Indonesia than most of the Nations around the South China Sea.
Indonesia is relatively big in population - over 267 million people, it is the world’s 4th most populous country as well as the most populous Muslim-majority country.
It has the 14th biggest land area, and sits like a fence blocking Chinese access to the Indian Ocean, and Middle Eastern oil and gas. Also, it has the 16th largest GDP.
Indonesia has a history of violence against their Chinese minority population, and communists, who tried to take over the country by force (and were supported by China). When I say violence, I mean killing over a half million people, and purging communists so hard, that it leaves Beijing stepping carefully a half century later.
Indonesia has a history of violence against their Chinese minority population, and communists
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not to mention wholesale slaughter of Christians