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I would like to do Solr to store the whole index instead of multiple segments

The closest thing to customize it, is documented here:

Generally, a Lusen optimization Reduces the index Some variables in a segment can change that behavior, such that an optimize can not be reduced in a segment .

Note that this is a very expensive operation, and generally it should not be done very often, documents will have to be added, modified or deleted, and will have to resize you. Will be required.

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