public final PoolingAsyncClientConnectionManagerBuilder setPoolConcurrencyPolicy(final PoolConcurrencyPolicy poolConcurrencyPolicy) {
        this.poolConcurrencyPolicy = poolConcurrencyPolicy;
        return this;
    }
Sets {@link PoolConcurrencyPolicy} value.

@return this instance.
httpclient5/src/main/java/org/apache/hc/client5/http/impl/nio/PoolingAsyncClientConnectionManagerBuilder.java