Make WriteBatchWithIndex moveble #1899
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`WriteBatchWithIndex` has an incorrect implicitly-generated move constructor (it will copy the pointer causing a double-free on destruction). Just switch to `unique_ptr` so we get correct move semantics for free.
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WriteBatchWithIndexhas an incorrect implicitly-generated move constructor (it will copy the pointer causing a double-free on destruction). Just switch tounique_ptrso we get correct move semantics for free.