When running Strategy 2021 in a 32-bit operative system, sometimes the search index gets broken and rebuilding it with as per KB482892 doesn’t work. JAVA HEAP ERROR would indicate that the I-Server needs additional size. However, it is the opposite.
According to Oracle, the maximum theoretical heap limit for the 32-bit JVM is 4 GB. But due to various additional constraints such as available swap, kernel address space usage, memory fragmentation, and VM overhead, in practice the limit can be much lower. On most modern 32-bit Windows systems the maximum heap size will range from 1.4 GB to 1.6 GB. The search index is limited to a little less than that.
The highest maximum heap size value that has been observed to work is 1095 MB. Any value above it may break the search engine. Set the heap size to 1095MB or less.